X (Kross) series

Current holder of this idea: Ethanthegamer (a.k.a. ETG)

The X (or Kross) series is a crossover series for many! The first being Klonoa X Mega Man.

Kross games

 * Klonoa X Mega Man: MT Framework, Playstation 3, Wii U, Xbox 360, Nintendo 3DS, GigaCom, Playstation Vita
 * Soul Eater X Disgaea: Wii U, Playstation 3, Xbox 360, Nintendo 3DS, Playstation Vita
 * Gurren Lagann X G Gundam (coming soon...): Playstation 3, Xbox 360
 * EarthBound X Zelda: Wii U, Nintendo 3DS
 * StarFox X Pokemon (coming soon...): Nintendo 3DS
 * SEGA X Nintendo: Demolition: Wii U, Nintendo 3DS
 * Dr. Mario X Dr. Light: Nintendo 3DS
 * Mario X Sonic: Heroes: Wii U
 * Pokemon vs. Digimon: Ultimate Generation: Wii U, Nintendo 3DS, GigaCom