Question about battle scripts...

Is it possible to have battle systems that change depending upon which characters you choose? If so, how would one implement it so it works? I would guess there would have to be switches to turn the systems off and on, but I'm unsure of how else this would work.

And, in case I'm not clear enough up there, I mean like this...depending on which character you pick, you get a different system.
Character 1: ABS (Zelda-esque)
Character 2: Rock Paper Scissors (High attack, Mid attack, Low attack--one misses, one does no damage but blocks the other's attack, one does severe damage)
Character 3: Shooter (Snatcher for Sega CD style, where you use arrow keys to aim in 9 different directions and a specified key to fire)

You could but all of them would have to be compatible, I would imagine - and I don't think that at the moment you can do this just by throwing different battle systems into your database.

That'd take a lot for someone to script too, wouldn't it? I'm completely new at scripting, but all my ideas seem to revolve around either scripts or massive eventing and variable/switch systems that I've got very little practice at...

Any advice on how I might pull this off? Or should I just make separate games for each character..? That'd be simpler and take up less space per download, but would mean I'd have a lot more games to put together. As is, I'll be making four to go in a 'series' that explain different view points on the 'war' going on. I planned on a beginning area for each game, taking on the view of an older, more experienced character, then after the intro, you pick which of the others for each side you want to play as.