Rat kings are phenomena said to arise when a number of rats become intertwined at their tails. Historically, there are various superstitions surrounding rat kings, and they were often seen as an extremely bad omen, particularly associated with plagues.
Mouscedes King Boo York, Boo York Monster High Doll, 2015 (I have her) - She is the daughter of The Rat King, & Boo York royalty. She's a rabid shopper with a talent for finding all the best sales. Her freaky flaw is that she's lactose intolerant. Her favorite activity is any kind of dancing. Her pet peeve is the stigma against rats. She used to be embarrassed to be the Rat King’s daughter, but now she knows that being a monster princess rules.