Downloadable content (SSBU), but it's all third-parties with the sole exception of Piranha Plant

In the Super Smash Bros. Ultimate Nintendo Direct on November 1st, 2018, Masahiro Sakurai confirmed that paid DLC would be available for Ultimate. The initial wave of content comes in the form of five Challenger Pack bundles, each containing one entirely unique fighter, one stage, and several music tracks. These bundles, which are also available through a complete pack known as the Fighters Pass, were released periodically through January 28th, 2020. Additionally, was available for free as a limited time early purchase bonus, and is currently available for purchase separate from the Fighters Pass. On November 6th, 2018, Sakurai announced on his Twitter account that the initial DLC line-up was finalized, and that potential fighters were proposed by Nintendo, with Sakurai passing final approval on them.

During the Nintendo Direct on September 4th, 2019, Nintendo revealed that more DLC fighters were set to be in production after the first Fighters Pass, due to Ultimate's strong sales. As with before, Nintendo proposed the potential fighters and Sakurai passed final approval. On January 16th, 2020, Fighters Pass Vol. 2 was announced alongside Cuphead, with the previous Fighters Pass retroactively being dubbed Vol. 1. The Pass will include six Challenger Packs; just like in Vol. 1, each pack contains one fighter, one stage, and several music tracks. Both Cuphead and Vol. 2 were made available for purchase on January 28th, 2020. These six packs are planned to be released by December 31st, 2021. According to Sakurai, this will be the last DLC released for Ultimate. He also said that the DLC characters for the Fighters Pass Vol. 2 may face delay or that development may be stopped indefinitely due to the COVID-19 pandemic. Because of lockdowns in various cities in Japan, development will continue through remote working. Despite this, development for the Fighter Pass Vol. 2 is going smoothly without problems as of April 2020.

Updates
Updates to the game are downloadable at no extra cost. In order to use DLC, the game must be updated to the latest version, which can be done automatically by starting the game from the system's Home Menu, or manually triggered from the Switch's Home Menu. Most updates also adjust game balance and mechanics, while fixing glitches and other errors as well. Changelogs for all updates are available at the links above.

As with any other game, DLC data is added via free updates. Completing a transaction to receive DLC is merely a "ticket" to grant access to said content. What this means is that DLC not purchased in an updated version is still technically installed but locked, and thus is accessible indirectly. Content that is locked can be seen and played against with opponents connecting via a system that has paid for the DLC (within Wireless and Online modes). Aside from this, locked content can also be seen using amiibo as Figure Players, and saving uploaded or shared replays.

Fighters
As every veteran is in the base game and none were cut, all DLC characters are newcomers.

Each DLC character is unlocked in Adventure Mode: World of Light after awakening 10 fighters.

Standalone Fighter

 * (MyNintendo release: January 29th, 2019; Formal release: February 1st, 2019)
 * Piranha Plant was revealed as the first DLC fighter in Ultimate during the final Super Smash Bros. Ultimate Direct on November 1st, 2018, and was released on January 29th, 2019. It was available as a free bonus until January 31st, 2019 to anyone who purchased the digital version of Ultimate or registered their physical version with MyNintendo. While Piranha Plant is not part of any Fighters Pass or any Challenger Pack (and thus does not come with a stage, music, or spirits), it was made available for purchase separately on February 1st, 2019. It is the only DLC character with a unique Palutena's Guidance conversation.

Fighters Pass Vol. 1

 * (April 17th, 2019)
 * Joker from Persona 5 was announced as the second DLC fighter during The Game Awards 2018 on December 6th, 2018, and was released on April 17th, 2019. He is the first playable character included with the Fighters Pass Vol. 1. As part of Challenger Pack 1, his accompanying stage is Mementos, and features music from Persona 5 as well as Persona 4, Persona 3, and the original Revelations: Persona.


 * (July 30th, 2019)
 * Four protagonists from Dragon Quest serving under the generic moniker of Hero were announced as the third DLC fighter during Nintendo's E3 2019 Direct on June 11th, 2019 and was released on July 30th, 2019. He is the second character included with the Fighters Pass Vol. 1. As part of Challenger Pack 2, his accompanying stage is Yggdrasil's Altar and features music from Dragon Quest XI, III, IV, and VIII.


 * (September 4th, 2019)
 * Banjo & Kazooie from the Banjo-Kazooie series were announced as the fourth DLC fighter during Nintendo's E3 2019 Direct on June 11th, 2019 and were released on September 4th, 2019. They are the third character included with the Fighters Pass Vol. 1. As part of Challenger Pack 3, their accompanying stage is Spiral Mountain, and features music from Banjo-Kazooie and Banjo-Tooie.


 * (November 6th, 2019)
 * Terry Bogard from the Fatal Fury series was announced as the fifth DLC fighter during Nintendo's September 2019 Direct, on September 4th, 2019 and was released on November 6th, 2019. He is the fourth character included with the Fighters Pass Vol. 1. As part of Challenger Pack 4, his accompanying stage is King of Fighters Stadium, and features music from various SNK franchises, which includes Fatal Fury and The King of Fighters, along with series such as Art of Fighting, Samurai Shodown, and Metal Slug.


 * (January 28th, 2020)
 * Cuphead was announced as the sixth DLC fighter during a Mr. Sakurai Presents video on January 16th, 2020 and was released on the 28th of that same month. He is the fifth and final character included with the Fighters Pass Vol. 1, with Mugman taking up one half of his alternate costumes. As part of Challenger Pack 5, his accompanying stage is Floral Fury, and features music from the game of the same name.

Fighters Pass Vol. 2
More DLC for Ultimate was announced on September 4th, 2019, along with Terry, and was fully revealed to be in the form of a second Fighters Pass known as Fighters Pass Vol. 2 announced on January 16th, 2020, along with Cuphead. It was said there would be six new Challenger Packs in Vol. 2 instead of five, with its contents set to roll out before the end of 2021.


 * (June 29th, 2020)
 * During the March 26th, 2020 Nintendo Direct Mini, a character from ARMS was revealed to be the first DLC character of Fighters Pass Volume 2 and this character would be in development. During a Mr. Sakurai Presents video on June 22nd, 2020, it was announced to be Min Min. She was released on June 29th as part of Challenger Pack 6. Her accompanying stage is Spring Stadium, which features music from ARMS.


 * (October 13th, 2020)
 * Steve from Minecraft was announced as the eighth DLC fighter during a Mr. Sakurai Presents video on October 1st, 2020, with Alex, Zombie, and Enderman as his alternate costumes. He is the second fighter featured in the Fighters Pass Vol. 2, and was released on October 13th, 2020. As part of Challenger Pack 7, his accompanying stage is Minecraft World, which has random layouts and features music from Minecraft minigames and spinoffs.


 * (Sephiroth Challenge: December 17th, 2020; Formal release: December 22nd, 2020)
 * Sephiroth from Final Fantasy VII was announced as the ninth DLC fighter during The Game Awards 2020 on December 10th, 2020. He is the third fighter featured in the Fighters Pass Vol. 2, and was formally released on December 22nd, 2020. However, for a limited time, a special event called the Sephiroth Challenge allowed players to battle him as a boss if they had purchased Challenger Pack 8 or Fighter Pass Vol. 2 prior to the formal release; if won, they could use Sephiroth and some other contents of his Challenger Pack early. As part of Challenger Pack 8, his accompanying stage is Northern Cave, which features music from Final Fantasy VII and Final Fantasy VII: Advent Children.


 * (March 2021)
 * Crash Bandicoot was announced as the tenth DLC fighter during Nintendo's February 2021 Direct on February 17th, 2021. He will be released in March 2021 as part of Challenger Pack 9.


 * Challenger Pack Fighters 10-11 (2021)
 * The identities of the next two characters currently remain unknown.

Standalone Stage

 * SSBU-Small-Battlefield.jpg Small Battlefield (August 4th, 2020)
 * Small Battlefield was added as a standalone stage as part of the 8.1.0 update. The stage is identical to with the exception of the removal of the top platform, and the remaining two floating platforms being slightly closer to each other.

Fighters Pass Vol. 1

 * SSBU-Mementos.jpg Mementos (April 17th, 2019)
 * Mementos comes as a set with as part of Challenger Pack 1. Mementos has one main platform with a slant in the middle similar to Meta Crystal, with one platform over the center and another over the left side. Trains periodically appear in the background, the set below the stage being able to damage fighters. Occasionally, a large triangle-shaped wall appears at the top or on the sides of the stage. The trains and the walls will never appear at the same time.
 * If a song from Persona 3 or Persona 4 is playing during a match, the color scheme of Mementos will change from red to blue or yellow respectively, the respective primary colors for each game. The decoration in the background also changes to either a moon or the streaks found in Persona 4's UI. If Joker wins a match with the alternate music, the victory pose screen and subsequent music change accordingly to the ones found in the home series.


 * SSBU-Yggdrasil'sAltar.jpg Yggdrasil's Altar (July 30th, 2019)
 * Yggdrasil's Altar comes as a set with the as part of Challenger Pack 2. It consists of a flat main platform that travels over the world of Erdrea, with smaller platforms appearing on occasion. Treasure chests may appear on one of these platforms. Usually, opening them will release an item, but these chests may sometimes be Mimics that can damage fighters; defeating them will cause them to drop an item.


 * SSBU-Spiral Mountain.jpg Spiral Mountain (September 4th, 2019)
 * Spiral Mountain comes as a set with as part of Challenger Pack 3. The fight takes place on the peak of the titular mountain. The stage will rotate every so often, which determines whether or not fighters can stand on the slope of the mountain. Floating platforms and a bridge to Gruntilda's Lair will also appear on occasion.


 * SSBU-Fatal Fury Stage.jpg King of Fighters Stadium (November 6th, 2019)
 * King of Fighters Stadium comes as a set with as part of Challenger Pack 4. It is a stadium based on "The King of Fighters" tournament. The stage is completely flat, and there are no bottom blast zones. The blast zones on the sides are blocked off by an invisible wall that can be broken when opponents are dealt enough knockback.


 * SSBU-Floral Fury.jpg Floral Fury (January 28th, 2020)
 * Floral Fury comes as a set with as part of Challenger Pack 5. It is based on the boss level of the same name from Cuphead and features Cagney Carnation as the stage boss.

Fighters Pass Vol. 2
On January 16th, 2020, six more Challenger Packs were announced to be in development and bundled with six new fighters.
 * SSBU-Spring Stadium.jpg Spring Stadium (June 29th, 2020)
 * Spring Stadium comes as a set with as part of Challenger Pack 6. It consists of a single floating platform with periodically-activating bounce platforms on both edges as well as on a soft platform hovering above. Periodically-appearing small bounce platforms may appear beneath and to either side of the main platform as well. Stadium arches are located near the upper blast zone, and can be used to break an otherwise KO-inducing fall.


 * SSBU-Minecraft World.jpg Minecraft World (October 13th, 2020)
 * Minecraft World comes as a set with as part of Challenger Pack 7. It has six different biomes, each with a slightly different layout. Each biome has blocks that can be destroyed and platforms above the stage.


 * SSBU Northern Cave.png Northern Cave (Sephiroth Challenge: December 17th, 2020; Formal release: December 22nd, 2020)
 * Northern Cave comes as a set with as part of Challenger Pack 8. it consists of a single floating platform with two soft platforms just above both edges. The background is an animated tracking shot depicting the ending of Final Fantasy VII. The background does not affect the stage in any way.
 * A special limited time event called the Sephiroth Challenge (only available if Challenger Pack 8 or Fighter Pass Vol. 2 was purchased prior to the formal release) would allow players to battle Sephiroth as a boss. If won, they could use the Northern Cave stage and some other contents of Challenger Pack 8 prior to the 22nd.


 * SSBU-Crash Stage.png Crash Bandicoot Stage (March 2021)
 * The currently unnamed Crash Bandicoot stage will come as a set with as part of Challenger Pack 9.


 * Challenger Pack Stages 10-11 (2021)
 * What the stages are for the next two challengers have yet to be announced.

Modes

 * (April 17th, 2019)
 * Houses spirit battles for the spirits associated with each Challenger Pack.
 * Stage Builder (April 17th, 2019)
 * A returning mode from Brawl and for Wii U.
 * Video Editor (April 17th, 2019)
 * In the Video Editor, multiple replays can be modified and strung together to create a full video.
 * Version 4.0.0 allows players to add screenshots to their videos.
 * Shared Content (April 17th, 2019)
 * Shared Content enables sharing, downloading, and liking Stage Builder levels, Mii Fighters, and videos created by other users.
 * Version 4.0.0 allows players to play videos consecutively.
 * Version 5.0.0 allows players to customize the movesets of downloaded Mii Fighters.
 * amiibo Journey (May 31st, 2019)
 * Online option that allows players to send their amiibo against each other.
 * VR (May 31st, 2019)
 * Compatibility with the Virtual Reality was added in the 3.1 update, allowing players to view certain stages in a full 360 degrees.
 * Spectator Mode (July 30th, 2019)
 * A returning mode from Brawl and Smash 4, players can bet for prediction points that can be used to purchase items.
 * Online Tourney and Event Tourney (July 30th, 2019)
 * A returning mode from Smash for Wii U, the rules are preset, with special event tourneys being held from time to time.
 * Home-Run Contest (September 4th, 2019)
 * A returning mode from Melee, Brawl, and Smash 4. Added in the 5.0.0 update, Home Run Contest has been stated to be, at the moment, the last mode added to Ultimate.
 * Rematch (June 29th, 2020)
 * A feature of the Spirit List that allows players to rematch any spirits unlocked at any time. A high score is added for each spirit rematched, based on the strength of the player's equipped team.
 * Sephiroth Challenge (December 17th, 2020)
 * A special limited time event that was only available when Challenger Pack 8 or the Fighter Pass Vol. 2 was purchased. It allowed players to challenge Sephiroth as a Boss, and if victorious, granted players early access to Sephiroth and the Northern Cave stage prior to the official December 22nd, 2020 release date. This special event ran from December 17th-22nd, 2020.

Mii Costumes
Additional costumes for the Mii Fighters are available as paid DLC, with a total of 78 pieces of headgear and outfits as of Round 8 of DLC Mii Costumes.

Bonuses for purchasing the Fighters Passes
(December 7th, 2018)
 * The Rex Mii costume is exclusive to purchasing the Fighters Pass Vol. 1 and consists of the Rex wig and outfit, based on Rex from Xenoblade Chronicles 2.

(January 28th, 2020)
 * The Ancient Soldier Gear Mii costume is exclusive to purchasing the Fighters Pass Vol. 2 and consists of the Ancient Helm and Ancient Cuirass, based on the Ancient Soldier Gear available to Link in The Legend of Zelda: Breath of the Wild.
 * {|class="wikitable"

!Costume!!Outfit Build
 * Rex Wig, Rex Outfit ||
 * Ancient Helm, Ancient Soldier Gear || Mii Swordfighter
 * }
 * Ancient Helm, Ancient Soldier Gear || Mii Swordfighter
 * }

Round 1
(April 17th, 2019)
 * The first wave of Mii Fighter outfits was among the first available DLC for Ultimate. It features costumes from the series, as well as the returning  series costumes from Smash 4.
 * {|class="wikitable"

!Costume!!Outfit Build
 * Morgana Hat || N/A
 * Persona 4 Protagonist Wig, Persona 4 Protagonist Outfit || Mii Swordfighter
 * Teddie Hat || N/A
 * Persona 3 Protagonist Wig, Persona 3 Protagonist Outfit || Mii Swordfighter
 * Tails Wig, Tails Outfit ||
 * Knuckles Wig, Knuckles Outfit ||
 * }
 * Persona 3 Protagonist Wig, Persona 3 Protagonist Outfit || Mii Swordfighter
 * Tails Wig, Tails Outfit ||
 * Knuckles Wig, Knuckles Outfit ||
 * }
 * Knuckles Wig, Knuckles Outfit ||
 * }

Round 2
(July 30th, 2019)
 * The second wave of Mii Fighter outfits features costumes from the series. Thus far, it is the only round to not include returning costumes from Smash 4 as well as the only one not to contain costumes from outside the series of its corresponding DLC character. Oddly, the trailer music is the standard Ultimate theme instead of any Dragon Quest music.
 * {|class="wikitable"

!Costume!!Outfit Build
 * Veronica's Hat, Veronica's Outfit || Mii Swordfighter
 * Erdrick's Helmet, Erdrick's Armour || Mii Swordfighter
 * Martial Artist Wig, Martial Artist Gi || Mii Brawler
 * Slime Hat || N/A
 * }
 * Martial Artist Wig, Martial Artist Gi || Mii Brawler
 * Slime Hat || N/A
 * }
 * }

Round 3
(September 4th, 2019)
 * The third wave of Mii Fighter outfits differs from the previous rounds as they are unrelated to the released fighter in that there are no costumes from said fighter's corresponding series. Instead, new costumes come from the Pokémon, Goemon, and Undertale series, while two Mega Man costumes return from Smash 4. Sans' costume also comes with a remix of MEGALOVANIA, and is the first Mii costume to come included with a music track.
 * {|class="wikitable"

!Costume!!Outfit Build
 * Goemon Wig, Goemon Outfit || Mii Swordfighter
 * Proto Man's Helmet, Proto Man's Armor || Mii Gunner
 * 's Helmet, Zero's Armor || Mii Swordfighter
 * Team Rocket Hat, Team Rocket Outfit || Mii Brawler
 * Sans Mask, Sans Outfit,  || Mii Gunner
 * }
 * Team Rocket Hat, Team Rocket Outfit || Mii Brawler
 * Sans Mask, Sans Outfit,  || Mii Gunner
 * }
 * Sans Mask, Sans Outfit,  || Mii Gunner
 * }

Round 4
(November 6th, 2019)
 * The fourth wave of Mii Fighter outfits features costumes from the Samurai Shodown, Art of Fighting, and King of Fighters franchises, as well as the returning Virtua Fighter series costumes from Smash 4.
 * {|class="wikitable"

!Costume!!Outfit Build
 * Nakoruru Wig, Nakoruru Outfit || Mii Swordfighter
 * Ryo Sakazaki Wig, Ryo Sakazaki Outfit || Mii Brawler
 * Iori Yagami Wig, Iori Yagami Outfit || Mii Brawler
 * Akira Wig, Akira Outfit || Mii Brawler
 * Jacky Wig, Jacky Outfit || Mii Brawler
 * }
 * Akira Wig, Akira Outfit || Mii Brawler
 * Jacky Wig, Jacky Outfit || Mii Brawler
 * }
 * Jacky Wig, Jacky Outfit || Mii Brawler
 * }

Round 5
(January 28th, 2020)
 * The fifth wave of Mii Fighter outfits is the final round coinciding with the initial set of the Fighters Pass Vol. 1. Like Round 3, the costumes included are unrelated to the released character, as no Cuphead costumes are present. Instead, it features costumes from the Assassin's Creed, Rabbids, and Fire Emblem franchises, in addition to the remaining Mega Man series costumes from Smash 4.
 * {|class="wikitable"

!Costume!!Outfit Build
 * Altaïr Hood, Altaïr Outfit || Mii Swordfighter
 * Rabbids Hat || N/A
 * 's Helmet, X's Armor|| Mii Gunner
 * MegaMan.EXE's Helmet, MegaMan.EXE's Armor|| Mii Gunner
 * Byleth Wig, Byleth Outfit || Mii Swordfighter
 * }
 * MegaMan.EXE's Helmet, MegaMan.EXE's Armor|| Mii Gunner
 * Byleth Wig, Byleth Outfit || Mii Swordfighter
 * }
 * Byleth Wig, Byleth Outfit || Mii Swordfighter
 * }

Round 6
(June 29th, 2020)
 * The sixth wave of Mii Fighter outfits is the first round of costumes for Fighters Pass Vol. 2, and features costumes from ARMS, Splatoon, and Fallout, as well as the returning Heihachi costume from Smash 4.


 * {|class="wikitable"

!Costume!!Outfit Build
 * Ninjara Wig, Ninjara Outfit || Mii Brawler
 * Heihachi Wig, Heihachi Outfit || Mii Brawler
 * Callie Wig, Callie Outfit || Mii Brawler
 * Marie Wig, Marie Outfit|| Mii Gunner
 * Vault Boy Mask, Vault 111 Jumpsuit|| Mii Gunner
 * }
 * Marie Wig, Marie Outfit|| Mii Gunner
 * Vault Boy Mask, Vault 111 Jumpsuit|| Mii Gunner
 * }
 * Vault Boy Mask, Vault 111 Jumpsuit|| Mii Gunner
 * }

Round 7
(October 13th, 2020)
 * The seventh wave of Mii Fighter outfits features costumes from Minecraft, Bomberman, and No More Heroes, in addition to the returning Gil costume from Smash 4.


 * {|class="wikitable"

!Costume!!Outfit Build
 * Creeper Mask, Creeper Outfit || Mii Brawler
 * Pig Mask, Pig Outfit || Mii Brawler
 * Diamond Helm, Diamond Armor || Mii Swordfighter
 * Gil Helm, Gil Armor || Mii Swordfighter
 * Bomberman Mask, Bomberman Outfit || Mii Brawler
 * Travis Wig, Travis Outfit|| Mii Swordfighter
 * }
 * Gil Helm, Gil Armor || Mii Swordfighter
 * Bomberman Mask, Bomberman Outfit || Mii Brawler
 * Travis Wig, Travis Outfit|| Mii Swordfighter
 * }
 * Travis Wig, Travis Outfit|| Mii Swordfighter
 * }

Round 8
(December 22, 2020)
 * The eighth wave of Mii Fighter outfits features outfits from Final Fantasy VII, as well as the returning Chocobo Hat (also from the Final Fantasy series) and Geno costume from Smash 4.


 * {|class="wikitable"

!Costume!!Outfit Build
 * Barret Outfit || Mii Gunner
 * Tifa Outfit || Mii Brawler
 * Aerith Outfit || Mii Swordfighter
 * Chocobo Hat || N/A
 * Geno Hat, Geno Outfit || Mii Gunner
 * }
 * Chocobo Hat || N/A
 * Geno Hat, Geno Outfit || Mii Gunner
 * }
 * Geno Hat, Geno Outfit || Mii Gunner
 * }

Spirits
While some spirits are available for free, usually launched during Spirit Board events, others require a purchase from another character. These spirits (excluding fighter spirits, which can be unlocked through or purchased from the shop for 300 coins) can be accessed through a special DLC-exclusive Spirit Board that does not have spirits expire or use the puppet fighter scene.

A handful of other spirits are also updated when certain Mii Costumes are purchased and downloaded. These spirits can either come from the base game or can be DLC exclusive, but will change to include new costumes or songs that are related to the spirits.

Nintendo Switch Online Free Items
These free item bundles are special offers exclusive to Nintendo Switch Online members; typically releasing close to the release date of a new Challenger Pack. They are available to download for a limited time only, and distribution will end without warning.
 * Spirit Board Battle Set 1 - For Tackling All Sorts of Spirits (July 30th, 2019)
 * Includes 1,500 SP, 10 Shuffle All, 10 All Primaries, 10 All Supports.
 * Spirit Board Battle Set 2 - For Powerful Spirits (August 30th, 2019)
 * Includes 1,500 SP, 5 Rematch, 5 Damage 50%, 5 Weaken Minions, 5 Health Drain.
 * Vault Shopper Set - Classic Tickets and Gold for Music, Mii Costumes and More (November 4th, 2019)
 * Includes 5,000 G, 3 Classic Tickets.
 * Spirit Training Set - Bolster Your Spirits (January 27th, 2020)
 * Includes 3,000 SP, Snack (S) x 100, Snack (M) x 30, Snack (L) x 5.
 * Spirit Board Challenger Pack 5 - Snipe Your Targets (June 25th, 2020)
 * Includes 10 All Primaries, 10 All Supports, 5 Rematch, 10 Sluggish Shield, 10 Shield Spacer
 * Vault Shopper Set 2 - Classic Tickets and Gold for Music, Mii Costumes, and More (October 8th, 2020)
 * Includes 3,000 G, 5 Classic Tickets
 * Spirit Board Challenger Pack 7 - Challenge Powerful Enemies! (December 16th, 2020)
 * Includes 3,000 SP, 5 Rematch, 5 Damage 50%, 5 Weaken Minions, 5 Health Drain

Challenger Packs
Every fighter, with the exception of, is bundled with a stage, music tracks, and spirits related to the fighter on a DLC Spirit Board. With the exception of fighter spirits, these DLC spirits can also be purchased from the Vault Shop even if their respective Challenger Packs are not purchased. There are five Challenger Packs in total in the Fighters Pass Vol. 1, and six in Fighters Pass Vol. 2. Both Passes are priced at a discount.

Fighters Pass Vol. 2
Songs in bold italics denote Smash arrangements. Spirits in bold denote fighter spirits.

Challenger Packs and Fighters Pass
The pass can be purchased with the digital version of Super Smash Bros. Ultimate at a combined price.

Trivia

 * Following the announcement of the and, the Super Smash Bros. Ultimate Official Site went from listing six DLC characters (, , and four "unknown"/empty slots) to listing eight (adding the Hero and Banjo & Kazooie without removing any of the empty slots). As there was no corresponding announcement of additional downloadable characters, this was likely an error, and it was later fixed. A similar mistake was later made with 's addition, maintaining four empty slots instead of replacing one. This was also fixed.
 * Every DLC stage has featured other characters making cameos on the stage (though in Floral Fury's case, only one character, Cagney Carnation, appears in the form of a stage boss instead of a generic cameo, while in Spring Stadium's case, the characters only make cameos on the jumbotrons in the background, and in Northern Cave's case, the cameos only lie in the unseen characters piloting the Highwind).
 * Challenger Pack 4 currently holds the most music added as downloadable content in both Ultimate and SSB4's history, with a total of 50 tracks.
 * Similarly, Fatal Fury has the highest music count out of any third party series across both games, due to the various tracks from multiple series.
 * Challenger Pack 1 is the only Challenger Pack to not have a Mr. Sakurai Presents presentation, instead having a presentation similar to a traditional Nintendo Direct.
 * Challenger Pack 5 is currently the only Challenger Pack to have none of its contents revealed prior to its Mr. Sakurai Presents presentation, only them be revealed during it. While Challenger Packs 1 and 6 also did not reveal their contents, their fighters, Joker and a character from ARMS, were revealed prior to their presentations (at the Game Awards 2018 and a March 2020 Nintendo Direct Mini respectively). Additionally, while the short presentation that contained Steve's reveal trailer was considered part of a Mr. Sakurai Presents, the longer in-depth video was released a few days after.
 * Challenger Packs 5 and 8 are also the only ones so far to include music tracks that can play in multiple stages, not including, Small Battlefield, , and.
 * With the exceptions of, and , every DLC character has at least one other character to assist them in their Final Smash.
 * Piranha Plant summons Petey Piranha.
 * Joker summons the Phantom Thieves in one of two groups of three.
 * Hero summons the seven other Heroes not represented as costumes.
 * Banjo & Kazooie summon a group of Jinjos and The Mighty Jinjonator.
 * 's involves six characters from ARMS.
 * 's features several Zombies and Creepers.
 * is powered up by Aku Aku in his Final Smash, as seen in his reveal trailer.
 * Thus far, every DLC fighter that is part of a Fighters Pass has had a cinematic Final Smash.
 * With the sole exception of Piranha Plant (referred to by its Japanese name "packun"), every downloadable fighter’s name in the code differs from that of their actual names.
 * Joker's code name is "jack", referencing Jack Frost, a recurring character from the Shin Megami Tensei and Persona series.
 * Hero's is "brave", which is a direct translation of his Japanese name, Yusha.
 * Banjo & Kazooie's is "buddy", referencing their two-in-one nature.
 * Terry's is "dolly", a pun based on the Japanese pronunciation of the last syllables of his surname and first name, respectively (Bogādo Terī).
 * Cuphead's is "porcelain", which is the material that most cups are made of.
 * Min Min's is "tantan", which is a type of ramen noodles, referencing her love for the food.
 * Steve's is "pickel", which is the Japanese word for ice axes, deriving from the German word "Eispickel".
 * Sephiroth's is "edge", a likely reference to his famously long sword Masamune in addition to the name of the city built on top of the ruins of Midgar in Advent Children.
 * Banjo, Kazooie and Min Min are currently the only DLC characters whose voice clips are recycled from their own games rather than recorded specifically for Smash, while Piranha Plant, Cuphead and Steve are the only DLC fighters thus far to not have any voice clips.
 * Erdrick, Banjo, and Kazooie are currently the only DLC characters to appear in an animated trailer other than their own. In this case, they appeared in Sephiroth's trailer.
 * In North America, when trailers for new Mii Fighter costumes are shown off, costumes of characters that are from an ESRB M-rated franchise only show the name of the character alongside the Super Smash Bros. Ultimate logo, rather than the logo of the franchise the character is from. So far, this has occurred with Altaïr from Assassin's Creed, Vault Boy from Fallout, and Travis Touchdown from No More Heroes.
 * Persona and Final Fantasy, which are also M-rated series, do not follow this pattern due to having playable characters (and the game that the latter series represents is not M-rated).
 * Other regions show the logo of the game regardless of the game's age rating.
 * Oddly, when the Mii Fighter costumes for Barret and Tifa were shown, the trailer in Sephiroth's Mr. Sakurai Presents video as well as the separate video with the Wave 8 Mii costumes uploaded the same day shows the Super Smash Bros. Ultimate logo next to the logo of Final Fantasy VII. However, the separate video was reuploaded on January 11, 2021, and for unexplained reasons, the Final Fantasy VII logo was changed to just Final Fantasy.
 * Despite that, the Super Smash Bros. Ultimate x Final Fantasy screen still appears during the Chocobo reveal.
 * Discounting the year as well as Piranha Plant's early release, every DLC character was released in a different month: Cuphead was released in January, Piranha Plant's formal release date was in February, Crash is set to be released in March, Joker was released in April, Min Min was released in June, Hero was released in July, Banjo & Kazooie were released in September, Steve was released in October, Terry was released in November, and Sephiroth was released in December.