Gus Augustus Monkey is Wally's older brother. Like Wally, he likes bananas and he is less intelligent than Wally. He Likes bananas, he is most immature. This also marks Wally Sings the Classics he continued appearance.
Gus has dark-brown fur and has a blue rocket suit with a grey belt which also has a star. He also has a long tail, a pink nose, and combed and groomed hair. His eyes are colored green. Gus is shown to have a long, black unibrow, which he has had ever since he was a baby.
Gus is very competitive; this is proven by his rage at He-Rilla and She-Rilla, the Rocket Gorillas, just because they are better then him, Wally and YAY-OK. Gus is also very bossy because he is the captain and loves to make his pet Inky draw stuff with his octopus ink.
Gus loves scareing people and goofing off with his younger brother.
Gus has a good relationship with YAY-OK because he helps him on missions
Gus has a crush on Monkevil.