Join Stefan's Tourney! http://community.us.playstation.com/t5/PlayStation-All-Stars-Battle/NEW-DATE-AND-TIME-Tag-Team-Takedown-Tournament/td-p/37621483
If I had the chance to have a certain character in, I would have Shyna Nera Shyna from Silhouette Mirage as part of the roster.
She has a diverse array of "parasites," allowing her to shoot lasers, wind scythes, poison gas clouds, and bombs, among others. She is also resourceful, and despite her small size, she can defeat opponents several times her size. The game is also only released in the US on the original Playstation.
Still, I doubt she would make it in, as I doubt she could be chosen over the far more popular characters. It's more of a wish than anything. o^o
Everyone on my wishlist has been talked about. But I can think of one I want that I haven't seen anyone talk about, and that's a Bloody Roar rep. I have fond memories of BR on The PSX and PS2, and the bulk of the franchise was PS exclusive. Sadly that series seems to have been completely forgotten That's why I don't have Yugo or Stun on my wishlist.