Doopliss is a Duplighost found in Creepy Steeple. He was first introduced in Paper Mario: The Thousand-Year Door, turning the people of Twilight Town into pigs.
Paper Mario: The Thousand-Year Door
Doopliss held a red Crystal Star that Mario needed to obtain. When Mario fought him, Goombella tried to find his name in the tattle log, but it wasn't there. He also turned into a clone of Mario and Mario turned into a purple outline of himself, making Mario's partners believe Doopliss was Mario and Mario was Doopliss.
Doopliss won the battle, and Mario's partners who thought Mario had won and got the star went with Doopliss. Mario then woke up and had to team up with Vivian and guess Doopliss' name in order to make him give Mario's body back. When he guessed the name correctly, they went to battle at Creepy Steeple once more. After Vivian found out about Mario's true identity, she left him alone in the battle. Despite this, Mario defeated Doopliss and their true forms showed again, revealing Doopliss and Mario as themselves. He then teamed up with Vivian's former teammates and tries to defeat Mario again, but ultimately fails.
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