M is for 13th letter.
- Mowgli (The Jungle Book)
- Matt (Cyberchase)
- Mung Daal (Chowder)
- Manny The Praying Mantis (A Bug's Life)
- Manny The Mammoth (Ice Age)
- Mo (The Land Before Time)
- Mufasa (The Lion King)
- Mavis (Thomas the Tank Engine and Friends)
- Mr. Messy (Mr Men)
- Mr. Mean (Mr Men)
- Mojo Jojo (Powerpuff Girls)
- Mittens (Bolt)