None. Sonys biggest strength is that they do not need to rely on a mascot. They have managed to make new IPs generation after generation that a bigger than what they had before.
Nintendo and MS need mascots because their devs have failed to make anything that could even come close to their initial successes like Mario/Pokemon/Zelda/Halo/Gears. Sonys mascot if anything is their top tier devs who can make huge critically acclaimed blockbusters from scratch.