Master Chief from Halo but also the Arbiter maybe?

They could throw in Bombshell as well as Duke Nukem. We're gonna be a bit starved for women here.

CoD I guess would be Captain Price or Soap McTavish if pulling from Modern Warfare or prior. Don't really know the characters from later games.

Never heard of Jet Force Gemini.

Throw in Joanna Dark with Oddjob.

Use the Rosie Big Daddy from Bioshock. More iconic than any of the actual playable characters anyway.

Pretty much anyone from TF2 would work. Heavy is a good iconic mascot for the game though.

Counter-Strike doesn't really have characters. You just have terrorists and counter terrorists. Quake does have characters and several different canons/universes. Though no one really cares about those characters lol

Crysis you have Nomad, Psycho or Prophet. I'd go with Prophet because Nomad has no personality and Psycho is boring. Prophet is the only one in all three games too.

I've never played Borderlands.

Snake? Snake?! SNAAAAAAAKE

Do Alex D. She doesn't get enough love and I like I said we need all the girls we can get. Also health leach drone and spider grenades are cool and unique.

Others:

Xan and Malcolm from Unreal Tournament

Doom guy!!

BJ Blazkowicz from Wolfenstein

John Clark for Rainbow Six

Some Commandos from Command & Conquer. Tanya and Ghoststaler maybe. Or Havok seeing as he was actually an FPS character

Someone from Overwatch I guess? Tracer? She's on the cover of the box

Whats his name from Titanfall 2

er... Timeshfit guy?

Strelok

Artyom

more russian dudes from janky eastern european games

I'm kind of running of stuff off the top of my head and I'm extremely tired