Sockdude

Sockdude is a sock who lives in Mario's bedroom. Luigi is scared of him, so he told Mysterious Guy to put him in the Jail of 100 Trials for 6310871098734670138309817987085340300303333 years. However, Mysterious Guy refused because Sockdude did nothing bad. He is friends with Mario. Sometimes Sockdude steals food from Mario and Luigi's pantry, and the brothers fight him for it. However he gives up and then they have a pizza party.