On a recent podcast Omar Kendall said that everyone has a different definition of a playstation all-star, I'm not sure I agree with his definition.
my definition of a playstation all-star is a character who has had a strong presence on playstation consoles and media also any first party charaters to playstation.
By the looks of it any new "all-stars" we get in the game are going to be from recent games or games that haven't even come out yet, I don't think we should get characters just to help promote a new game coming out.
Toro Inoue: the only official mascot on the Playstation brand. Theres a reason why he's called the Sony Cat.
However, when it comes to others, it really depends on certain things. Being able to survive the test of time and becoming a memorible character.
A lot of things could dictate what makes an All-Star: Sales, Recognizability, Critical Acclaim, and of course Fanbase.
To me, it's a combination of all those things. Take Kratos for example, he may not be as old as Crash. But he has most certainly left his mark on Playstation and gaming in general. He's instantly recognizable, his games have sold incredibly well, his games are very critically acclaimed, and his fanbase is pretty large.
I think most people are trying to peg a "PS All Star" as a veteran character. Which is really not the case.
Kat is a pretty recent character, but I shouldn't even have to explain why she's an All-Star.