Hopper

A cranky penguin villager in the Animal Crossing series. He is a crested penguin named after the Rockhopper penguin, even though his design is based off a Macaroni Penguin (the two look quite similar to the untrained eye; however, they're both crested penguins). He also appeared in Doubutsu no Mori. Hopper is the only penguin with a cranky personality. He has appeared in all games of the Animal Crossing series. He also appears on the album cover for K.K. Parade.

(Source: Animal Crossing Wiki)