Only three things matter to Quarrelous: his superhuman strength, his honor, and the time-honored art of wrestling in the Psymonster World. He is a powerful, combative, and pugnacious Psymonster who throws himself at every challenge that comes his way with satisfaction, counting on the strength of justice and his four muscular arms to save the day, no matter the odds or danger. When victory is his, he throws out his arms to the sound of roaring cheers and wild applause, which is a little strange when there doesn't seem to be any Psymonsters around. There are few situations that Quarrelous doesn't think can be solved with a valiant battle cry and a remarkable wrestling move. The spectacular thing isn’t that he treats life like it is all a big wrestling match in the Psymonster World – it is that so far, it has always worked.
He is a big red muscle ball with four muscular arms, seven yellow eyes, sharp teeth, black wristbands, and a black loincloth.
- The name "Quarrelous" is probably derived from the word "quarrel", meaning an angry argument or disagreement, typically between people who are usually on good terms.
- Quarrelous is one of the three Psymonsters who wear loincloths (the other two are Sinclops and Meduson).
- Quarrelous is one of the four Psymonsters who have four arms (the other three are Madagascaroach, Drivacuum, and Barbeetle).