Showbiz Pizza was, for the most part, superior to Chuck E Cheese's. I have vague memories of a gorilla keyboard player, but was absolutely terrified by Mitzi Mouse, who wore a green and white cheerleader uniform and thrust pompoms out stiffly with unbending arms.
I have some Showbiz artifacts...a calculator that looks like a book of matches, some tokens and skee-ball tickets, and a hideous Mitzi Mouse doll with a curly mohawk and dead, staring eyes.