5. Penta Penguin (Crash Bandicoot)
Let's say that you're a developer in the late '90s jumping on the kart racing bandwagon. You've got your mascot, his nemesis, his sister, his other nemesis, that mini boss from that one level, another nemesis that no one remembers, and a whole slew of minor characters to fill the roster. But something still seems to be... missing. Maybe you could throw in a palette swap? A challenger from outer space? Another nemesis? No, wait, it's all so obvious now--penguins.
This is (probably) how Penta Penguin got his start in the world of racing, and frankly it's probably one of the best decisions that Naughty Dog has ever made. The little guy is adorable, with an awesome scarf that says "I might be a penguin, but I get cold, too." Take note developers--whether it's a racer, a fighter, a shooter, an RPG, a MOBA, or any genre in between--there's no better finishing touch than a secret penguin.