Since the ps vita is getting a sony style supersmash bros game why not have an ios themed one? Fight as angry birds characters, the doodler from doodle jump, om nom from cut the rope... You know what? Nevermind this actually sounds pretty terrible lol... Edit: Decided to make a concept picture because I was bored. Not that great but I made it on my ipad so don't expect much... Also added the infinity blade guy just cause...
Nintendo owned the rights to the vast majority of the characters appearing in SSB; what you propose might be fun but isn't feasable. Unless you want to learn how to use Fighter Maker or MUGEN, that is.
Obviously not all ios characters would be in the game but it wouldn't be the first time where characters from other ios games showed up in another game by a different developer. An example would be john gore from minigore showing up in the game sway bike baron showing up in minigore... Since most ios developers are indie it wouldn't be hard asking them to beable to use their characters. So that wouldn't be a problem.Touch controls would be the biggest concern.
a couple ideas: regret from zenonia any character from battleheart a character from zombieville or zombieville 2 the two characters from heros lore 3 (like sora and riku kind of) the guy from vr mission (like snake) the guy from hybrid a geosociety trainer with the 3 main geomonsters arno from the game arno gravity guy fragger a shooter from modern combat the guy from nova the ninja from omg pirates urban ninja the league of evil or loe2 hero and villian(guy with the lightsaber type thing) and maybe scientist jetpack joyride angry birds guys from brutal streets the buddy from kick the buddy