Mr. Gus is a major character in Uncle Grandpa. He is a dinosaur man that protects Uncle Grandpa. He lives with Uncle Grandpa, Pizza Steve, and Giant Realistic Flying Tiger in the RV. He is very calm, unlike his friends, and is a very serious character.
Appearances in Christmas specials
In "Christmas Special", he decide to help Uncle Grandpa get a Christmas spirit by riding the sleigh ride to deliver presents for Santa Claus while one of the toys broke his leg.
In "Secret Santa", he and the gang are off to the mall to buy the present as Secret Santa but they keep sabotaging each other until they realize it was Pizza Steve who wrote all of his names on the Secret Santa notes.