Dimension Clash

Dimension Clash is an upcoming fighting game mod of Marvel vs Capcom 3's engine. It will feature characters from various medias, including video games, comics, and TV shows.

Summary
As mentioned previously, Dimension Clash will run on Marvel vs Capcom 3's engine, a.k.a. MT Framework. As a result, Dimension Clash will play very similarly to MvC3. Teams of three will fight against each other in a one-round match. The team who gets knocked out first loses. However, when time runs out, the team with the most vitality is declared the victor.

Offline Mode

 * Arcade (face off against six teams in order to save the multiverse against the game's final boss, Galactus)
 * Versus (two players will fight against each other offline)
 * Training (self-explanitory; it is recommended you come here when you first start playing)
 * Mission (complete various tasks with a desired character)

Online Mode

 * Ranked Match (fight online foes to rank up)
 * Player Match (play casual online matches)
 * Lobby (try to fight to be at the top of the lobby)
 * Leaderboards (see where you rank competitively)

Others

 * Gallery (view goodies like character art, endings, stage art, and listen to music and voice clips)
 * Options (adjust various setting of the game here

Characters
The full roster contains 42 characters, two of which are included as downloadable content.
 * Ryu (Street Fighter)
 * M. Bison (Street Fighter)
 * Mario (Super Mario)
 * Yoshimitsu (Tekken)
 * Kakashi (Naruto)
 * Zelos (Tales of Symphonia)
 * Lara Croft (Tomb Raider)
 * Deathstroke (Teen Titans)
 * Strider Hiryu (Strider)
 * Mudman (World Heroes)
 * Spawn (Spawn)
 * Aang (Avatar: The Last Airbender)
 * Akuma (Street Fighter)
 * Poison (Final Fight)
 * Phoenix (X-Men)
 * Spider-Man (The Amazing Spider-Man)
 * Liu Kang (Mortal kombat)
 * Donkey Kong (Donkey Kong Country)
 * Guile (Street Fighter)
 * Kazuya (Tekken)
 * Super-Skrull (Fantastic Four)
 * Doronjo (Yatterman)
 * Bugs (Looney Tunes)
 * Daffy (Looney Tunes)
 * Bean (Sonic the Fighters)
 * Dante (Devil May Cry)
 * Dormammu (Doctor Strange)
 * Deadpool (X-Men)
 * Paul (Tekken)
 * Shuma-Gorath (Doctor Strange)
 * Viewtiful Joe (Viewtiful Joe)
 * Nemesis (Resident Evil)
 * Superman (Superman)
 * SpongeBob (SpongeBob SquarePants)
 * R. Mika (Street Fighter)
 * Sektor (Mortal Kombat)
 * Rocket Raccoon (Guardians of the Galaxy)*
 * Mewtwo (Pokémon)*
 * Savage Dragon (The Savage Dragon)*
 * Jedah (Darkstalkers)*
 * Mr. Game & Watch (Game & Watch Gallery)**
 * Vergil (Devil May Cry)**

single *= unlockable character

double *=DLC character

Stages

 * Daily Bugle
 * Mushroom Kingdom
 * Arkham Asylum
 * Yatterman's Workshop
 * Republic City
 * Aensland Castle
 * Spear Pillar
 * Hon-Maru Temple
 * Training Room
 * Fate of the World (Galactus only)

Website
I have a whole wiki based on this idea. Here it is.