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Doopliss is a minor character in SuperMarioGlitchy4's videos who is a darker version of Paper Mario. He appeared three times: first was in the blooper Super Mario 64 Bloopers: WEEGEE Disease, the second was in Super Mario 64 Bloopers: Hunt for the Hero's Clothes and the third time was Super Mario 64 Bloopers: Orbical Adventures.
Both times he stole something for no apparent reason. The first time Mario met him he defeated him, however the second time Mario shot and him, he tossed the clothes. He reappears in Super Mario 64 Bloopers: Orbical Adventures, where he got shot again but dies for real, which might explain why he hasn't appeared in later videos.