Created by Dr. Jumba Jookiba as Experiment 624, Angel was genetically engineered to revert rehabilitated experiments and individuals to their original evil programming using a specialized siren song. This song contains a neuro-linguistic behavioral modification trigger reversible by chanting the melody backward. Physically resembling Stitch (Experiment 626), she features pink fur, a slightly shorter stature, a smaller purple nose, longer eyelashes, larger dark purple eyes, rounded ears without notches, two long tendril-like antennae, and a subtly puffed-out chest as part of her feminine design. Activated on Earth during her debut in *Lilo & Stitch: The Series*, Angel was captured by Captain Gantu. As part of his plan, she infiltrated Lilo’s household by feigning affection for Stitch. Her song failed to corrupt Stitch due to his later creation date granting immunity but successfully reverted other experiments to evil. After luring Stitch into a trap, guilt over betraying him led her to rescue him by reversing her song’s effects on captive experiments. Gantu recaptured her shortly afterward despite this redemption. Rescued in the episode "Snafu," Angel joined the reformed experiments and developed a romantic relationship with Stitch, affectionately calling each other "boojiboo." She fought against the Leroy clones in *Leroy & Stitch*, employing martial arts to defend Stitch and contributing to their defeat. Years later in the *Stitch!* anime, Angel achieved intergalactic fame as a singing sensation, adopting a more self-centered demeanor while maintaining her bond with Stitch. Her relationship exhibited periodic fickleness—briefly transferring affections to Experiment 627 (disguised as a human duke), a confidence-boosted Reuben acting as a "rebel," and Kijimunaa after he accidentally defeated Stitch. These attractions ended swiftly: she rejected 627 following his betrayal, lost interest in Reuben due to his negligence, and recommitted to Stitch by the Valentine’s Day special. Stitch’s emotional dependence surfaced when his fear of her disapproval surpassed his fear of water. Angel aided Stitch in critical missions, thwarting Dark End’s attack in the series finale and assisting in *Stitch and the Planet of Sand*. She also appeared under Hämsterviel’s control in the two-part Season 1 finale "Stitch vs. Hämsterviel" and the special *Stitch! Perfect Memory*. Angel’s personality balances sweetness with occasional volatility, shifting from initial manipulative seductiveness to post-reformation loyalty toward Stitch and their extended 'ohana. Her performing career necessitated a long-distance relationship with Stitch, though they shared leisure moments like driving around Izayoi Island. She appeared briefly in the 2025 live-action *Lilo & Stitch* film during a genetic modification discussion scene.