Pt. 1: Teresa Foxington

Reason to get akumatized: After another argument with Diane, Teresa snaps and said that she wished that she wouldn't be related to Diane, and Diane argued that she wished Teresa was normal like her. When she left for another press, the akuma went into Teresa's clown mask she used to scare children during Halloween

Shadowmoth: Joker, I am Shadowmoth. Your own sister won't let you do anything fun, but with my power, you'll make your own rules and have everyone laugh along with your pranks. Those that stand in your way will become the clowns that you've made them into. In return, you must bring me Ladybug and Cat Noir's miraculous.

Teresa: We'll see who's normal now when I turn your frown upside down, Diane!

Powers: She can shoot a beam from her finger to turn anyone into a clown slave and has unlimited slime bombs