Mr. Devious is a made up Mr. Men character by Brian Ring.
- Name: Mr. Devious
- Personality: Devious and Evil (Season 1 only), Mischievous (Season 2 onwards)
- Alias: Little Miss Naughty, Little Miss Scary and Mr. Rude
- Enemies: all the other Mr. Men and Little Misses
- Likes: Being Devious, P**n, Shed 17, Project G-1, Shrek, Thomas the Tank Engine parodies, Youtube, Youtube Poop, South Park and Family Guy
- Dislikes: Getting forced to do things he doesn’t want to do, School, Studying, Thomas the Tank Engine, Disney and Being nice.