Any of these 3rd party characters in the game and I'm happy:
- Big Daddy (Bioshock)
- John Mashton (RDR)
- One of the main story GTA guys (CJ from San Andreas, Vercetti from Vice City, Niko from GTAIV, Claude from GTAIII)
- Chell (Portal)
- Max Payne
- Snake
- Sonic
- Crash
- Cloud
- Shepard
- Batman
- Ezio
- Isaac
- Guybrush (MI)
- Any RE character
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Any of these 1st party ones
- Nathan Drake
- Either Elena, Chloe, or Sully, having them all in there would be too much Uncharted
- Gabe Logan
- Maiden in Black
- Jak and Daxter
- Ratchet and Clank
- Chimera
- Cole (Infamous)
- Joel (The Last of Us)
Any of these stages from 1st and 3rd party
- Wipeout
- Shadow of the Colossus
- Sonic
- Monkey Island
- Stage from a sandbox game or two
- Stage from Boletaria
- Resident Evil
That's all I can think of off the top of my head. Just one or two from each block is good enough for me.