Umi Prowler, a sixteen-year-old female fox from Planet Morbius, stands out with her vibrant yellow fur and striking blue hair, which cascades down her back in gentle waves. Her piercing blue eyes hold a depth that speaks of her tumultuous past and the resilience she has cultivated. Umi's unique physical trait is her two tails, a rare genetic marker among her kind, symbolizing her connection to ancient fox lore. She often dons a simple yet elegant white dress that flows to her knees, complemented by black shorts for mobility and practicality. Her ensemble is finished with white boots, ready for any adventure or battle that comes her way.

As Tails' older sister, Umi's life has been intertwined with the world of Sonic the Hedgehog and his allies. Her planet, once a vibrant ecosystem, was devastated by the relentless Mecha Sonic 2.0, a creation of the diabolical Dr. Eggman. This catastrophe not only destroyed her home but also ignited a fierce determination within her to prevent such devastation from occurring elsewhere. Umi's quest for justice and restoration led her to harness the Phantom Ruby, a powerful artifact that amplifies her innate abilities.

Trained by Blaze the Cat, Umi has mastered the art of fire manipulation, her flames dancing with a ferocity that mirrors her resolve. Additionally, her illusion powers, derived from the Phantom Ruby, allow her to deceive her enemies, creating mirages that confuse and disorient. These abilities are crucial as she navigates the challenges posed by Dr. Eggman and his mechanical minions, including the formidable Mecha Sonic 2.0.

Umi's journey is fraught with conflict. Not only does she face external threats from Eggman's forces, but she also grapples with the internal struggle of using the Phantom Ruby's power responsibly. Her encounters with the Super Mario Brothers and her quest for the Chaos Emeralds further complicate her mission, as she seeks to restore balance and peace to the universe. Despite these obstacles, Umi's unwavering spirit and her bond with allies like Sonic and Blaze propel her forward, driven by the hope of rebuilding her world and protecting others from the fate that befell Morbius.

Her unique quirk is her habit of humming ancient fox melodies when deep in thought or planning her next move, a soothing ritual that connects her to her heritage and calms her amidst chaos. As Umi continues her journey, her story unfolds with the promise of redemption and the possibility of a new beginning for her and her planet.