Koops is a Koopa Troopa and one of Mario's partners in Paper Mario: The Thousand-Year Door. When Mario visited Koops's hometown, Petalburg, Koops was extremely shy and didn't say much. But, just as Mario was moving on, Koops begged Mario to take him on his quest in order to avenge his dead father. His loving girlfriend, Koopie Koo, was reluctant to see him go, worried about him, but Koops insisted. After their adventure, Koops was said to return to Petalbug, marry Koopie Koo, and run for mayor. In the events of Super Koopa Mario!, Koops lives in Koopasburg.
Koops appears on the Paper Team in New Super Mario Baseball. His stats have yet to be revealed.