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Lumas are minor characters in the SMG4 series.
They are baby Stars from the Super Mario Galaxy video games series. They are very loyal to their Princess Rosalina, who considers them as her children. In SuperMarioGlitchy4's canonity, they appeared in his video "SM64 Bloopers: Shoot to the Observatory in the Sky". Some appear in the pile of people waiting to Super Smash each other in the ass Bros. in SMG4: War On Smash Bros Ultimate.
They look like stars and come in the following colors: red, green, yellow, blue, black, or even purple.