That's a good idea!
But, I have to warn you about something:
-if you're gonna make this a Choujin project, please don't make spriteswaps: this means you don't have to use a .sff file and copy it in a char;
look at Tomo chars, they're just
SSJ Goku -> Yamcha sprites added and some FX and sound, the gameplay is the same;
Tien -> Chiaotzu sprites swapped and added some FX and sound, the gameplay is the same as Tien's;
Krillin -> Roshi spriteswap and soundswap;
don't make them like that
(I'm not the only one who thinks this)
-come up with something creative (I saw that you talked in the Choujin chars topic: did you see those great video in tudou? Maybe you could use some ideas from those).
Good luck on the project. Put a lot of effort in it, and I'm sure this could be a great game. You already worked on the screenpack, which is good, don't waste your work.
Some mods have to move this topic to "Projects".