Monique

Monique, often called Mo, is Arthur's cousin. She appears in "Arthur's Cousin Catastrophe" at the Read Family Reunion. She has been mean to Arthur at past reunions, but at the one in "Arthur's Cousin Catastrophe," she is much nicer to him. After seeing Arthur play piano at past reunions, she decided to learn how to play. She also reveals to Arthur that he's her favorite relative and that the only she comes to the reunion is to play with him.