Koei Tecmo - Ryu, Atelier rep
Namco - Dig Dug, Llyod, KOSMOS, Taiko no Tatsujin , Agumon, Dark Souls Rep, Soul Calibur Rep, God Eater Rep,
Square - Bubble Bobble, Bravely, Sora, Kain or Raziel, Lara Croft, Space Invaders, Aya, Star Ocean Rep, SaGa rep, Mana rep. (Rpg list goes on), Neku, Balan Wonderland Protag (this one might be a possibility)
Sega - Alex Kidd, NIGHTS, Phantasy Star Rep, Akki, Sakura, Arle, Kiryu
Activision - Crash, Spyro, Diablo Rep, Tracer, Pitfall Rep
EA - Sims
Atlus - Shin Megami rep, Etrian Odyssey rep
Capcom - Dante, Ammy, Arthur, Monster Hunter, Phoenix, Viewtiful Joe
Nihon Falcom - Adol, ToCS rep
Microsoft - Master Cheif, Conker, other Rare reps
Konami - Frogger (I mean, they killed Goemon. and Bomberman twice)
Warner Bros - Maxwell, Mortal Kombat
Valve - Gordan Freeman, Chell, TF2 rep
Sakurai - Fighting Dragons character (wouldn't it be cathartic to have a prototype character from the original smash prototype be a DLC character. Anyone else?)