I liked Aska from Tournament Fighters. Probably because she was a girl. Be-bop and Rock Steady, of course. Those 4 mutated frogs that Shredder made. And Vanilla Ice.

a cameo by the StarFox Landmaster...

Krang, Cyber Shredder, Chrome Dome and just to piss everyone off, Venus de milo to make her canon.

@VonShigsy: That'd be awesome XD I loved that live-action show.

wow. that is a good question. I don't even know where to begin.

A topic about characters people want in the new TMNT game, and Mona Lisa appears in the original post. I'm not complaining as I would've said her.

I want a few Usagi Yojimbo characters in the mix, starting with Miyamoto Usagi (not the "Usagi Yojimbo" from the original animated TMNT), Gen, Tomoe, Chizu, and definitely Jei (no TMNT appearance, but he totally rocks); but I'd really prefer a full blown UY game instead of having cameos in a TMNT game.

For me, it'd be Shredder(Who's a shoe-in anyway), Baxter Stockman, Casey Jones and maybe Krang.

Bebop & Rocksteady.

Mechaturtle and Slasher

I agree with Karai, also Splinter, as well as the original Master Yoshi (who either was Splinter in human form, or was Splinter's owner, depending on which continuity you look at)