I had a bit of fun playing my roommate in this. I won a grand total of one match, really, but he's typically better at fighters than I am. Lately, since he got a PS2, we've been on a Marvel vs Capcom 2 kick, and transitioning to TvC works out pretty well.
I haven't yet picked out a second character, but my first main is going to be Roll, pretty much just for the fun. Also, I love that she has a healing special. It's surprisingly incredibly helpful. That, and he special where she sets the opponent on fire, then douses them with a giant water bucket definitely make her a valid character.
Apparently, some moves can reflect projectiles. One of Roll's can, so keep your eyes out for that, if you enjoy the game.