Ms. Sheri Squibbles is Scott "Squishy" Squibbles' mother. She is a large, middle-aged female monster who is pink and has five eyes like her son, but wears a flowery blue shirt and blonde hair that is held together with hair curlers. It is also revealed that she has a fondness for death metal, and likes to refer to it as her "tunes".
At the end of the movie, Don Carlton announces he and Sheri are engaged, which Squishy deems as "weird" due to his friend marrying his mother.
"Ms. Squibbles is a doting, single parent who encourages, accommodates, and more so, coddles her only son, Scott "Squishy" Squibbles. Squishy is 19 years old and still lives at home, but who can blame him? Ms. Squibbles is Monstropolis' best mom—she cooks for him, does his laundry—she even acts as house mom when he has his "little friends" over to play fraternity."