Moe (Adventure Time)

Moseph "Moe" Mastro Giovanni was an old man who founded MO Co. and created BMO and all the other MOs. He says that BMO was created to experience fun and to care for his son, but he never managed to start a family. When asked by Finn if he was a human, he responded that his skin is human. He could have once been a full human like Finn, but it seems that as he grew old, most of his body parts except the skin and possibly his brain were replaced by machines.