Nobody brought up Sweet Tooth from Twisted Metal for the Sony characters. Him and PaRappa would be my most wanted, both because they’re cool in their own right and I also liking seeing more genres represented in Smash. Kratos is probably the biggest name now and would be the biggest indicator of “holy crap, a PlayStation character is in Smash”. To varying degrees, Ratchet & Clank, Aloy, Joel & Ellie, Astro Bot, Sackboy, Lemmings, Q*Bert, and many others all have merits…maybe they could try PSASBR again, also. Who knows?
I’ve learned from other discussion that Crash absolutely has merit to be in as well, and be considered as iconic in the gaming sphere as general. More or less, he’s about as well off as Mega Man and Castlevania were before Smash, and definitely more so than the often compared Banjo, who is absolutely “washed”, as they say. Crash can at least say he’s got a successful series, rather than two games that sold less than Croc. But perhaps I should be quiet while I’m ahead on that. Rayman is about equal with Crash, IMO, though I’d put Crash slightly ahead in general popularity. Unfortunately, Spyro would be very unlikely to join either, due to almost no presence in Japan.