Mouscedes King is the daughter of the Rat King and a supporting character in Monster High: Boo York Boo York.
She was voiced by Rachel Staman.
Mouscedes is a little spoiled brat, but inside she has a heart of gold. She loves being pampered, even when there is no reason to do so. She likes her luxurious life, always shopping. She has high standards when it comes to food and clothes and can be a bit picky sometimes.
Mouscedes has gray skin, soft pink hair, a rat tail and big ears. Above her mouth she has whisker markings, as dots, and buck teeth peeking out of her mouth. Her fur is noticeably longer on her lower arms and legs.
- May 7, 2014: Mattel requests the trademark for Mouscedes King.
- December 31, 2014: Pictures of Mouscedes King are leaked from an online survey.
- February 14, 2015: Mouscedes King is officially revealed at New York Toy Fair.
- May 7, 2015: Mouscedes' profile is published in the Monster High website.
- May 7, 2015: Mouscedes' artwork is revealed.
- September 29, 2015: Mouscedes King makes her 3D cartoon debut in Boo York, Boo York (TV special)
- Her monster parent may be a reference to the antagonist from the Nutcracker Ballet, the Mouse King.
- Her monster parent may be a reference to the European folklore, where a Rat King would be many rats with tails tied together or stuck with various substances. This is rather unlikely due to her appearance and personality, which are more consistent with the Nutcracker theory.
- Her first name is a pun on the name Mercedes and the word mouse.
- The fact that she loves to dance might be inspired by the Nutcracker, the ballet her father's origin is likely derived. Her shoes also resemble ballet slippers.