Cleo Knight is the only daughter of Mr. and Mrs. Knight, and the only granddaughter of Ingrid Nummet Knight (the founder of Ink Inc.) She is a brilliant chemist and is very close to her identical twin housekeepers, Zada and Zora. She also owns a fancy car called Dilemma. She is working on a formula to make invisible ink in hopes of restoring Stain'd-by-the-Sea to its former self.