I'd love to have end of Resistance 2 Hale as a playable. Or maybe a stage hazard would be awesome.
In truth, I'd love to see a Chimera as a playable fighter. Since this thread needs more stuff we've talked about before in it, this is my personal top 8 list of DLC editions I'd love added to the game (bringing the roster up to 30). All first and second party (probably the easiest characters to land)
1) Ellen - Folklore - Her attacks would be a mix of the various Folks she captures.
2) Alundra - Alundra - He would use all of his tools and skills from his game. Very Link like, actually.
3) Jen Tate - Primal - This is a serious one. I love Jen. She's use her different forms to change her fighting style, and can summon Skree to help her in battle as well.
4) Lazarus Jones - Ghosthunter - Yes, he's human, but his arsenal would be his cool ghost capturing equipment, and he could utilize his astral projection powers in his supers.
5) Rau Utu or Tati - The Mark of Kri/Rise of the Kasai - Rau would be the anti Kratos. Tati would be the anti-Dante or Raiden. Rau is brute strength, Tati is lightning speed and agility.
6) Max or Monica - Dark Cloud 2 - Personally, I just want some Level 5 reps in the game. Jeanne D'Arc, Jaster Rogue, or Max and Monica.
7) Chimera - Resistance - Like the Helghast, I think the Chimera are pretty cool and iconic looking. I'd like to maybe see the Berserker, with some of the alt skins of the other species. The weapons of the Resistance series were always awesome, so that alone would make the Chimera a different beast from the other projectile users.
8) Gabe Logan - Syphon Filter - I don't think Gabe gets enough love, but to me, he's just as much PlayStation as Kratos, Ratchet, and Nate Drake. His gadgets and tools would also give him the chance for a really unique and fun combat style.
And those are my top choices. With their addition to the roster, I'd really geek out on a PlayStation nerd high.
If the third parties want to play:
1) Tifa Lockhart or Vivi
2) Tomba
3) Crash Bandicoot
4) Solid Snake/Big Boss/Old Snake/The Boss
5) Chris, Jill, Claire, or Leon
6) Amaterasu
7) Klonoa
8) Ubisoft wild card: The Prince of Persia. Screw Ezio or Connor, bring in the original acrobatic badass. Sands of Time version, with time altering abilities as supers, and have his alts be from the other PoP games (from Sands, through to PoP 2008).