This is a category for villains who are minor to the Ben 10 plot.
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- Ma Vreedle
- Mad Pakmar
- Malachi Sisters
- Mann Family's Bodyguard
- Margie
- Mazuma
- Mech Dragon
- Mechadroid
- Mino-Toga
- Missy
- Moe
- Mouse Minions
- Mummy
- Muroid
- Mutant Bat (Classic)
- Mutant Frog
- Mutant Hornet
- Mutant Mosquito
- Mutant Octopus
- Mutant Seagull (Original Series)
- Mutant Seagull (Ultimate Alien)
- Mutant Snail
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