Rudy is a monster who resembles a reindeer. He has tan fur, a deep voice, a narrow face, dark hair, and wears a thin mustache and goatee.  A jovial and lighthearted person, Rudy resembles Sans in his use of humor and jokes to lighten the mood, and is lively and talkative He is close with and protective of Noelle and likes playing video games with her. He has a voracious appetite for her friends, especially boyfriends and girlfriends.