Suggested additions/changes:

Capcom: Chris Redfield/Leon Kennedy

Epic Games: Jazz Jackrabbit

Konami: Alucard (Castlevania)

Marvelous AQL: Adol Christin (Ys), Ninja (Senran Kagura)

Microsoft Studios: Marcus Fenix

NIS America: Laharl (Disgaea), Neptune (Hyperdimension Neptunia)

Sony Computer Entertainment: Kratos, Toro Inoue, Jak & Daxter

Square Enix: Moogle (Final Fantasy), Slime (Dragon Quest), Garrett (Thief), J.C. Denton (Deus Ex), Lara Croft (Tomb Raider), Agent 47 (Hitman)

Tecmo Koei: Kasumi (Dead or Alive), Lu Bu (Dynasty Warriors), Totori (Atelier)

Valve: GLaDOS, Companion Cube

Sonic and Mega Man have special place in my childhood. 16 bit era they were among the best games.

Well, Konami and Bethesda are the only ones on that list where I've played both games the mascots come from. And the Dragonborn isn't really even a mascot so I'm going to say Konami

Huh... tough one.

From a games perspective I have to take Konami. Metal Gear Solid is amongst the best franchises ever created. Period. (my opinion) I also love Bomberman, though that love is coming from a time before Konami, where Hudson was on their own.

Honorable mentions are Ubisoft with Rayman and Sega with Sonic.

Valve's second mascot should be the Companion Cube.

EPIC Games didnt make Fat Princess.  I believe that was Santa Monica.

As for fav duo i dont really have one.  I think some of the best third parties include EPIC, Bethesda, Take-Two, etc.  As for mascots, and big Ip's id have to go with EA. PvZ, TitanFall, Sims, and Mass Effect to name just a few.

As for quality, like i said, EPIC, Bethesda, and Take-Two would prob be my picks.

Sonic and Gordon Freeman were the best at the time :p

Ezio and Rayman Definitely.

Sony have a mascot?

Microsoft, ea,epic games,wb