Mr. Devious is a made up Mr. Men character by Brian Ring. He is also the main antagonist of The Mr. Men Show.
- Name: Mr. Devious
- Personality: Devious, Rude and Mischievous
- Alias: Little Miss Naughty, Little Miss Scary, Mr. Rude, Little Miss Trouble (If she returned in The Mr. Men Show), Mr. Mischief (If he returned in The Mr. Men Show) and Little Miss Bad (If she returned in The Mr. Men Show).
- Enemies: all the other Mr. Men and Little Misses
- Likes: Being Devious, Shed 17, Project G-1, Shrek, Thomas the Tank Engine parodies, Youtube, Youtube Poop, South Park, Family Guy, Inappropriate Stuff and Horror Films (Especially IT)
- Dislikes: Getting forced to do things he doesn’t want to do, School, Studying, Thomas the Tank Engine, Disney and Being nice.
- He is named after Mario Van Rooy’s nickname “Mr. Devious”.