Waluigi is Wario's friend who is thought to be his brother by some, but nobody knows since he usually just appears in random Mario games without saying many things other than "WAA" and "You're cheating!" He appears in the Rise of Sqeegee 7 and fights the possessed Muneegee. He shoots a kamehameha wave at him and the two have a beam struggle, which Waluigi wins, killing Muneegee, but reverting Sqeegee to his normal form. In the Rise of Sqeegee 8, Waluigi fought against Gentle Sqeegee alongside Wario, eventually overpowering him. Waluigi appears in the Rise of Weegee, where "Weegee" has a proposition for him, but Waluigi refuses and is threatened with death.
- He and Wario are confirmed to be amongst the last members of the great warriors called Wasenhairs in the Rise of Weegee.
- Waluigi's base form is more powerful than ROS7 Sqeegee's, Weegee's, and possibly "Weegee"'s, considering Waluigi almost killed Sqeegee twice.
- This proves how skilled members of the race Wasenhairs are.
- Waluigi is likely on the real Weegee's side because when "Weegee" gave him the proposition, he said "There is no honor in what you speak of."