Mischievous Villains or Troublemakers are evildoers who are playful, misbehaved, disrespectful and/or childish, as they do not always seek outright harm on others. However, mischievous villains may do some harm, but their evil plans don't generally do a lot of harm and their crimes are more harmless non-felony stuff like stealing and littering and they aren't to be taken all that seriously as threats.

However, mischievous villains are not meant to be taken too seriously; therefore, they cannot count as Pure Evil. Even in very rare cases, some Purely Evil characters can act mischevious in a much more dangerous and often lethal manner, (e.g. Junko Enoshima, Henry Evans, Dimentio, Dr. Robotnik, Green Goblin, Bill Cipher and The Joker), they should go under the Trickster and/or Thrill-Seekers categories instead.

Even if they are not Pure Evil, please DO NOT add villains who simply make sneaky smiles a lot, taunt/mock/tease their foes in a silly way at times or come off with sinister prank surprises, as this DOES NOT automatically mean that they are mischievous (e.g. Black Hat, Randall Boggs, Ercole Visconti, Aku, Oogie Boogie, Red Skull, Ghirahim, Fawful, Gallaxhar, Audrey II, Loki, Professor Ratigan and Azula). These villains may instead go under Faux Affably Evil.