Mimi was a boss from Super Paper Mario. She was a boss in Chapter 2 and in Chapter 8. She was a mini-boss in Chapter 6. Mimi has powers of deception and can become invincible under Bleck's powers.
Chapter 2[]
Mimi posed as a maid and tricked Mario by going into death traps. She failed and was chased out by a dog like creature. In 2-3, Mario repayed her 1 million rubies. In 2-4, Mimi chased Mario down the mansion basement and fought her. Mimi was defeated and retreated.
Chapter 6[]
In Chapter 6, she served as mini boss to distract Mario as he attempted to get the pure heart from the crumbling dimension. She succeeded and the dimension was destroyed.
Chapter 8[]
In 8-2, Peach faced off with Mimi. As they fought, Peach ended up winning. A trap floor opened and Mario and Luigi move on as they hear a giant crumble. Mimi also gave power to Mario in 8-4 to defeat Super Dimentio.
Reform[]
After the destruction of the void, she reformed to good in Flipside.