Loser d Tuani is a fictional girl in the Marioverse, she wants to be like Peach. She's a member of the Bad People, alongside Bowser, in order to kill Princess Rosalina for reasons unknown, but it might be because she just doesn't like her. Is part of the bad people her role is the random loser.
She also has a major grudge against Mario and is not afraid to make it shown. She says she hates him for "cursing" her with The Curse of Loserdom. However, Bario actually cursed her, and she mistook him for Mario. Her Bad People partner is Bad Luigi, who she works quite well with.
- She's a MAJOR boss in The Stupid Adventures of Po