You wouldn't have most of the game series you have now without the 90's been as you know Playstation started in the 90's and so did most of the series. Ignorance is fun!
Here is a list from some 90's characters in the game for you young ones. Sweet Tooth (Twisted Metal) PaRappa the Rapper (PaRappa the Rapper) Toro Sir Daniel Fortesque (MediEvil) Heihachi (Tekken) Spike (Ape Escape)(Suppose this counts)
Here are some characters that come from the 90's that could be in this game: Snake Spyro Cloud Crash Abe
The list goes on and on and the funny thing is some 90's games was/are a lot better than most the trash they have these days such as COD or your crappy online games.
One who knows nothing can understand nothing - GamerTag: wwinterj/PSN wwinterj