MonsterVerse (MetropolisKnight)

The MonsterVerse is a series of interconnected films centered around Toho kaijus. The franchise also crossovers with King Kong.

The MonsterVerse takes place in an alternate Earth timeline inhabited by "Massive Unidentified Terrestrial Organisms" (MUTOs), giant prehistoric monsters of various shapes, sizes, forms, and origins. Each of the films center around Monarch, a cryptozoological organization dedicated to studying the creatures.

Godzilla (2014)
Exactly the same as the real film

Main characters
 * Godzilla

Side characters
 * Dagon (skeleton)

Villains
 * Winged MUTO
 * Six-legged MUTO

Godzilla II (2018)
Godzilla clashes with his old enemy King Ghidorah

Main characters
 * Godzilla
 * Mothra
 * Rodan

Side characters
 * Behemoth
 * Quetzalli
 * Scylla
 * Wukong
 * Lilac
 * Aqrabuamelu
 * Shahmaran
 * Kong (cameo)

Villains
 * King Ghidorah

Godzilla: Final Awakening (2023)
Two factions of Xiliens are at war, the space ones and the Earth ones, the space ones send Gigan to wage war, clashing with Godzilla while the Earth ones are secretly creating a super weapon underneath the ground.

Main characters
 * Godzilla
 * Mothra

Side characters
 * Rodan
 * Quetzalli
 * Kong
 * Mecha-King Ghidorah (cameo)

Villains
 * Gigan
 * Xiliens

Destroy All Monsters (2024)
Set immediately after Final Awakening, the Earth Xilliens unleash Mecha-King Ghidorah, initiating the Second Great MUTO War

Main characters
 * Godzilla
 * Mothra
 * Rodan
 * Kong

Side characters
 * Quetzalli
 * Drukr
 * Kalia/Kong's mate (cameo)
 * Kiko (cameo)

Villains
 * Mecha-King Ghidorah
 * Gigan

Kong of Skull Island (2017)
Exactly the same as the real film except the Skull Island creatures are real-world cryptids (Ogopogo, Jersey Devil, Chupacabra, etc etc)

Main characters
 * Kong

Side characters
 * Skullcrawlers

Villains
 * Ramarak

The King Kong (2022)
Kong discovers a tribe of his species enslaved by the Alpha of the Hollow Earth and fights him to liberate them and become the King Kong

Main characters
 * Kong
 * Wukong

Side characters
 * Kalia
 * Tribe of Kongs
 * Mechagodzilla (cameo)

Villains
 * The Hollow Earth Alpha

Son of Kong (2027)
Main characters
 * Kong
 * Kiko
 * Quetzalli

Side characters
 * Kalia
 * Tribe of Kongs
 * Biollante (rose form)

Villains
 * Beetle Dragon King

Mothra and the Dark Divine (2021)
Set in ancient Japan, Mothra emerges to fight Battra

Main characters
 * Mothra

Side characters
 * Ryū

Villains
 * Battra

Mothra II (2030)
Main characters
 * Mothra

Side characters
 * Godzilla (corpse)

Villains
 * Biollante

Godzilla vs. Kong (2020)
Main characters
 * Godzilla
 * Kong

Side characters
 * Mothra (cameo)
 * Titan Skullcrawler
 * Winged MUTO of the Hollow Earth
 * Six-legged MUTO of the Hollow Earth
 * Skullcrawlers
 * King Ghidorah (cameo/flashback)

Rodan: Infestation (2021)
Main characters
 * Rodan
 * Quetzalli

Side characters
 * Behemoth
 * Megaguirus' spawns

Villains
 * Megaguirus

Terror of Mechagodzilla (2022)
Main characters
 * Mechagodzilla
 * Godzilla

Side characters
 * Kong
 * Wukong
 * Tiamat
 * Lilac
 * Baphomet
 * Scylla

MUTO appearances
Notes: One-off MUTOs (in their respective films): Megaguirus, Battra
 * Main: Main role
 * m: minor role
 * c: cameo
 * †: they die/they die in the last movie in the column

Trivia

 * I originally had Destroyah as the big bad on Destroy All Monsters before changing it to Mecha-King Ghidorah as it makes more sense if King Ghidorah, Godzilla's arch nemesis returns to end the Godzilla era
 * Bagan and Dagahra were considered as the villain in Mothra II
 * King Caesar was the main candidate as the Alpha of the Hollow Earth but since he's a Toho kaiju and King Kong is not, I scrapped him in favor of my own original character.