Mud is a very greedy, traitorous, & conniving 
Rotling zombie/smileball. Has a decay look, with most of his bone showing & his green-tinted skin appearing as if it is melting right off of his head, leaving strands stuck between his lips & several drops dangling from his chin. He wears a brown suit with a long coat, a short red tie, & a fedora on his head to hide his skullcap. His usually seen with a cigarette in his mouth. He has an Australian accent. 

[INFO took from the official wiki btw!!]