Sora, Riku, Kairi, Donald, and Goofy (Kingdom Hearts); Ash, Misty, Tracey, and Melody (Pokemon anime); Robin, Starfire, Beast Boy, and Raven (original Teen Titans cartoon); Taichi, Yamato, Sora, Mimi, Koshiro, Joe, Takeru, and Hikari (Digimon); Recca, Domon, Fuko, Mikagami, and Koganei (Flame of Recca); and Isami, Toshi, and Soshi (Isami Shinsengumi) meets Theodore DaCabe aka the new Prince or the Floating Man(that Chzo uses to replaces Cabadath by taking him through 3 blessed agonies(where one of them remind us about what MCU!Thanos goes through to get his soul gem) before Chzo Mythos joins my mega-crossover project)

and then Sora, Riku, Kairi, Donald, Goofy, Ash, Misty, Tracey, Melody, Robin, Starfire, Beast boy, Raven, Taichi, Yamato, Sora, Mimi, Koshiro, Joe, Takeru, Hikari, Recca, Domon, Fuko, Mikagami, Koganei, Isami, Toshi, and Soshi knew the name of the King(to be fair, at least some characters here are powered-up to make everyone fight together in nearly equal grounds)