Nintendo vs. SEGA: Ultra Rumble Fighters

Nintendo vs. SEGA: Ultra Rumble Fighters is a crossover fighting game, featuring characters from Nintendo and SEGA. It launches on the Nintendo 3DS, Nintendo Wii U and Nintendo NX and will release on May 5th, 2019 in Japan, September 9th, 2019 in Australia, November 11th, 2019 in North America and January 13th, 2020 in United Kingdom.

Characters
There are a total of 54 playable fighters in the game, with half from each company. Both companies have 16 default fighters, while the rest need to be unlocked, as you progress through the game. Note that shaded cells are unlockable.

Unlocking Criteria
This is a list of methods to unlock hidden characters that aren't available from the start.

Rival System
All characters have their specific rival to face. Some of these rivalries are common, but some are rare, depending if their rival is unlocked or not. These rivalries can be seen during Arcade Mode and Story Mode.
 * Fox McCloud vs. Bayonetta - Reason: Use a blaster (guns, in Bayonetta's case) as their main weapon.
 * Mr. Game & Watch and Alex Kidd - Reason: Oldest notable character of their company.

Non-Playable Characters
These characters aren't playable in the game, but appear in the game. Some characters appear as Assist characters, where NPCs help the summoner for a short amount of time.

Alternate Costume Characters
Alternate costumes return from the ''Super Smash Bros. ''series and some playable characters appear as some of the character's alternate costumes.
 * Dr. Mario - Mario
 * Pichu - Pikachu
 * Toon Link, Young Link - Link