Mimi

Mimi is the leader of the Duplighosts: Dupliss and Tripliss. She was first appeared in Peach's Quest Part 3.

Peach's Quest
Mimi was disguised as Kamek in the first movie but didn't make her appearance until part 3. Mimi brought the Mario Bros who are in the cage in the Crystal Place where no one would capture her.

Trivia

 * Mimi is based off of Super Paper Mario who is one of Count Bleck's followers.