Reuben, designated Experiment 625, is a genetic prototype for Stitch (Experiment 626) created by Dr. Jumba Jookiba. Initially dismissed as a failure due to profound laziness and cowardice, he possesses Stitch's full physical capabilities: super strength, wall-crawling, retractable claws, extra arms, enhanced intelligence, and advanced linguistic skills. His primary obsession is making and consuming sandwiches, frequently avoiding strenuous tasks unless forced. Physically, he features golden-yellow fur (teal-blue in early comics), a stout build, three head antennae with brown tips, droopy ears, a red nose, buck teeth, and three toes per foot—a distinguishing trait. First activated in *Stitch! The Movie* by Captain Gantu and Dr. Hämsterviel to torture Jumba, he ignored his mission to make sandwiches, resulting in his dismissal. Stranded on Earth after Gantu's ship crashed, he became Gantu's reluctant sidekick in *Lilo & Stitch: The Series*. While typically mocking Gantu's failures and evading conflict, he sporadically used his powers—like scaling walls or kicking Gantu—and displayed greater water tolerance than Stitch. His time as Jumba's lab assistant provided tactical knowledge of other experiments, occasionally aiding Lilo and Stitch for self-serving reasons, such as thwarting Experiment 627 to prevent personal annoyance. Despite his laziness, he shared a covert bond with Gantu, including moments like watching TV or tending to him when ill, and secretly viewed Stitch as a brother while rivaling him for Angel's affection. His arc culminated in *Leroy & Stitch* after Gantu abandoned him on Earth. Bitter and lonely, he converted Gantu's ship into a sandwich shop. Lilo visited, offering a peanut butter and jelly sandwich as peace, named him "Reuben," and persuaded him to embrace his potential. He repaired the ship using pickle juice and latent abilities, aiding Lilo's journey to warn the Galactic Alliance of Hämsterviel's coup (though they arrived too late). Reuniting with a reformed Gantu, he escaped capture and fought in the battle against Leroy clones by tripping them with sandwiches and playing saxophone during the "Aloha ʻOe" performance that disabled the army. This secured his role as Gantu's galley officer in the restored Galactic Armada, fulfilling his "one true place." In the non-canon *Stitch!* anime, Reuben and Gantu were fired from the Galactic Armada over a karaoke incident, forcing them to rejoin Hämsterviel. During Season 3, Hämsterviel modified Reuben to aggressively access his powers, granting a "bad boy" persona that defeated Stitch and briefly won Angel's affection. The transformation reversed upon witnessing incorrect sandwich-making, restoring his original personality. His final anime appearance showed him imprisoned with Gantu, Hämsterviel, and Delia. Additional appearances include a cameo in the 2025 live-action *Lilo & Stitch* film, shown in Jumba's visual aid labeled "625" during a threat to modify Stitch. Noted weaknesses include ticklishness and occasionally lower pain tolerance than Stitch, though his durability remains inconsistently portrayed. His intelligence encompasses mechanics and multilingualism, often delivered with Brooklyn-accented wit.