here's my favorite crossover team-ups:

- Sora, Riku, Kairi, Donald, Goofy, Ash, Misty, Tracey, Melody, Robin, Starfire, Raven, Beast Boy, Taichi, Yamato, Sora, Koshiro, Mimi, Joe, Takeru, Hikari, Recca, Domon, Fuko, Mikagami, Koganei, Isami, Toshi, dan Soshi dari Kingdom Hearts, Pokemon anime, Teen Titans 2003, Digimon, Flame of Recca, dan Soar High! Isami (with following specs: KH destiny trio take their kh2 looks, both Ash and Misty wears their Advanced Generation clothes while Melody wears her casual clothes, Raven have her hood open, all 8 Digidestined take their 02!Summer looks, and all 5 hokages take their Final Burning looks. to make everything fair, at least some characters in this team-up are powered-up to make everyone in this crossover ensemble can fight together in near-equal terms)
- anyone from Warhammer 40k universe(this doesn't need to be Imperium of Man people) with the protagonists of Happy Tree Friends, Mario Bros, Sonic the Hedgehog, and My Little Pony Friendship is Magic
- Marco, Tarma, Eri, and Fio from Metal Slug with any FPS game main character(this doesn't need to be Call of Duty character)
- Eduardo Rivera, Kylie Griffin, Garrett Miller, and Roland Jackson from Extreme Ghostbusters with Rick O'connell, Evelyn O'connell, Alex O'connell, and Jonathan Carnahan form the Mummy Trilogy

what do you think?