Mettaton EX is a character from the indie video game Undertale, created by Toby Fox. He is a robotic entertainer designed to capture the audience's attention with his flashy performances. Mettaton EX is known for his glamorous appearance, featuring a large, rectangular body and a spotlight on his chest, which he uses to showcase his abilities. In the game, Mettaton EX serves as a boss character that players must defeat to progress. He has various attacks that involve shooting projectiles and performing dance moves, making battles both challenging and entertaining. His personality is flamboyant and dramatic, reflecting his role as a star in the underground world.