- Gender: Female
- Species: Freckle Shark
- D.O.B: December 8th, 1990
- Height: 5'5"
- Orientation: Doesn't really care, just likes Mayhem
- Occupation: Freelance artist and designer
- Personality: Excitable, silly, mischievous (duh), creative, affectionate, slightly anxious/shy, nerdy as fuck
- Loves: Creating, video games, art, comics, cartoons, toys, drawing, electronic music, Mayhem (<3)
- Does not love: Cold weather, dry places, silence, lack of Mayhem 
Despite what her name and species might imply, Mischief is actually quite tame; more geeky and neurotic than anything else. The last thing on her mind is causing trouble for someone. Any mischievous behavior comes out through her art, with a sharp style and a compulsive urge to embellish any blank wall with some fresh paint. Her nervous tendencies are mostly due to the fact that she throws all of herself into her feelings. Everything is a big deal to her, even what are considered trivial bothers to others. Sometimes she can be difficult to deal with, but Mischief tries to make up for her quirks by devoting herself to her loved ones as much as possible.
- Likes: Art, design, creating, comics, cartoons, video games, portable gaming, table top gaming, reading, obnoxiously bright colors, hoodies, toy collecting, conventions, cosplay, dance music, 90s music, 80s music, swimming, warm water, rain, tea, sea food.
- Dislikes: Silence, cold anything, lack of Mayhem, dry places, magnets.
- Hobbies: Graphic design, video games, tagging, rollerblading, collecting crap. 
- Mischief is a "freckle shark", which was created by Squeedge based on black tip reef sharks, oceanic white tips, and leopard sharks in particular.
- She is depicted to be in a relationship with Mayhem by both Ren and Squeedge.
- Her "ears" are actually fins that have a flexible base, and are used for emoting.
- Mischief is particularly fond of portable gaming, and has a lime green Game Boy Color and a DS.
- Squeedge has stated that she does not want Mischief to be depicted in sexual / adult situations, and should only be drawn in romantic ways with Mayhem.