A boy from another underground village, in which the people worship Gunmen as Gods. When Gimmy and Darry are chosen to leave the village, Rossiu decides to go with them and they join the Gurren-dan.

Rossiu believes in taking the most rational and sensible course of action to problems, which puts him at odds with a world not built around sense or reason. On numerous occasions his logical approach results in conflicts with other members of the Gurren-dan, who see his perspective as defeatist or cowardly.