Mee Mee is one of Dee Dee's two best friends alongside Lee Lee. She likes the same things as Dee Dee and Lee Lee and often causes havoc in Dexter's lab with them or play with the Pony Puff Princesses they love so much! Mee Mee was voiced by Kath Soucie in her initial appearance and Kimberly Brooks in further episodes.
- Kimberly Brooks - English
- In Kit's Laboratory she is played by Nellie the Elephant.
- In Tori's Laboratory she is played by ???.