Mildred Pearl "Mertle" Edmonds is Lilo's main rival. She is a greedy and spoilt brat from a wealthy family, and the owner of Gigi (Experiment 007).

Mertle is established as Lilo's ex-friend at the beginning of Lilo & Stitch, where she is introduced as a popular girl and the leader of a clique composed of herself, Elena, Yuki, and Teresa in the hula halau. Mertle calls Lilo "Weirdlo" and refuses to include her in the girls' activities, in which Lilo responds (quite violently) by hitting her, pulling her hair, and biting her. Mertle and the other girls express fear and disgust of Lilo and her things, such as Scrump the Doll and Stitch. Mertle takes great pleasure in putting down, insulting, bullying, and making fun of Lilo.

Community content is available under CC-BY-SA unless otherwise noted.