Mertle Edmonds is Lilo's rival and a recurring antagonist in the Lilo & Stitch franchise.

== Appearance == Mertle is depicted as a small, somewhat overweight girl with distinctive long, fluffy red hair and fair skin. She wears round-framed blue glasses with tinted lenses and typically sports a light green, short-sleeved shirt and blue shorts, finished with light green flip-flops. Her sleepwear consists of a light blue, two-piece set adorned with yellow ducks and matching duck slippers. Notably, she also appears in a traditional Hawaiian outfit similar to Lilo's, featuring a red bandeau top, grass headdress, skirt, wristbands, and leg bands, exposing her shoulders and midriff.

== Personality == Mertle embodies the stereotypical spoiled and selfish child, leading a group of subservient girls. Her intense dislike for Lilo manifests in cruel nicknames like "Weirdlo" and "Freaklo," and she frequently attempts to get Lilo into trouble. Unforgiving and prone to holding grudges, she dismisses apologies with rudeness. The television series hints that her followers tolerate her bossy demeanor begrudgingly. Mertle derives pleasure from belittling, insulting, and bullying Lilo, often deflecting responsibility for her own actions. She has even callously targeted Lilo's vulnerability as an orphan. Her ignorance extends to the alien nature of Stitch and the experiments, which she mistakes for unusual Earth animals. Furthermore, she exhibits poor memory, failing to recognize experiments she has previously encountered, and struggles with literacy.

The series suggests that Mertle's antagonistic behavior stems from a rigid view of normality, leading her to dismiss anyone different. Leroy & Stitch implies her father's influence on this perspective. Mertle is also portrayed as dishonest, readily cheating, and framing others. However, instances like the "Yapper" episode reveal a capacity for kindness, as she ultimately awarded Lilo and Stitch a trophy despite her own efforts to win unfairly. Her affection for her "dog" Gigi is also evident. A moment in Leroy & Stitch hints at a possible respect for Lilo's late mother. The film's conclusion shows a softening of her animosity towards Lilo, as she joins the family picture at Gigi's insistence.

Subtle clues within the franchise suggest a potential separation or divorce of Mertle's parents, which could contribute to her bullying behavior and poor attitude. Her seemingly high regard for her father and adoption of his views might be a way to connect with him. The irony of her intolerance towards non-traditional families, given her own likely family situation, is also noteworthy. Her spoiled nature could be a result of her mother's attempts to compensate for their family dynamic. Jealousy of Lilo's familial love and happiness may also fuel her animosity.

== Trivia ==

• Mertle's name is a unique spelling variation of Myrtle.
• Lilo frequently refers to Mertle by her full name for unknown reasons.
• In the Disney Adventures comic Lilo's Luau, Mertle is referred to as "Jenny." Mertle once mistakenly "adopted" Hämsterviel.
• Her greatest fear, as revealed in "Spooky," is a headless Lilo.
• "Spike" reveals Mertle's illiteracy, possibly indicating dyslexia.
• The possibility of her parents' separation or divorce is subtly suggested in Leroy & Stitch. This could be a contributing factor to her bullying, often a defense mechanism stemming from insecurity and a need for control. Her discomfort in discussing her family issues with her friends further supports this. It's plausible that Lilo, having experienced her own parental loss, recognizes Mertle's underlying emotional distress, which might explain her continued willingness to see Mertle as a friend and offer help. Both girls have navigated non-traditional family structures. Without the arrival of Stitch, Jumba, and Pleakley, Lilo's path could have mirrored Mertle's.
• Mertle's status under the United Galactic Federation's protection as the caretaker of an experiment is unclear.
• Her relationship with Gigi parallels Lilo's with Stitch, both unknowingly adopting alien experiments from an animal shelter.
• Some recent books feature Mertle owning a poodle named Cashmere instead of Gigi.

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