Hamusuke

Hamusuke resembles a giant Djungarian hamster with a long snake tail. Before being inducted in the Great Tomb of Nazarick, Hamusuke was very boastful and prideful of his ability and power as the "Virtuous King of the Forest." However, since meeting Momonga and witnessing the power of the other Nazarickians, he has seen how vastly inferior he is. He accepts this and swears loyalty to Momonga, willing to do anything to please his master and earn his keep. (Source: Overlord Wikia)