Yes it's true; there is an official PlayStation mascot character. He is a cat called Toro Inoue, but he is only ever used in Japan. This video I made covers his complete history with a look at every single game across all PlayStation generations (including the PocketStation!), all recorded using real PlayStation hardware.
I guess this story never gets told in the west because of the Japanese language barrier, but don't worry I'll be translating as I go.
Please have a watch as it took a long time to create this and I'm proud of how it turned out.