Oblivion Sonic, hailing from the haunting lore of the Oblivion Ring universe, stands as a deeply complex, lanky, and fragile entity whose very existence is marked by profound trauma, physical endurance, and a shattered reality. Standing at roughly five feet tall with a unique bluish-grey coat of fur striped with a darker hue across his ears, he cuts a starkly different figure from traditional heroes. His appearance tells a harrowing story of survival: beneath his soft exterior lie strange linear scars and weathered, discolored skin on his arms, reminders of a catastrophic energy discharge that nearly claimed his life. His striking red eyes, framed by completely black sclera and white pupils, frequently leak dark tears whenever he experiences intense emotions like joy, sadness, or overexcitement. Beneath his quiet exterior lies a deeply soft-hearted soul struggling with severe anxiety, heavy stress, and social trauma, causing him to frequently zone out into silent 'abyss stares' or rely on random counting to ground himself during panic episodes. Despite the terrifying realities of his world—where mixed roles, intrusive stalkers, and the lingering scars of past disasters constantly threaten his peace—he remains fundamentally gentle, navigating his fractured universe with a quiet resilience while searching for trust, connection, and normalcy amidst the ruins. Oblivion Sonic is Transgender (Female to Male) and Bisexual!

Glitchy is a mint-green hedgehog with a peach-colored muzzle and matching peach patches on his inner ears and chest. His right eye socket is heavily damaged and marked with a white 'X,' while his left eye features a glowing pink iris set against a dark sclera. His mouth appears as a black void that flickers with bright pink digital static when opened. He has white bandages wrapped around his forearms and legs, with his right arm missing underneath the wrapping. Glitchy is Sonic/Oblivion!Sonic's best friend. Glitchy is kind, sweet, and loyal. He's also polyamory and pansexual.

Oblivion!Shadow is a dark hedgehog with midnight-black quills highlighted by sharp streaks of vibrant crimson. His head quills feature a distinct, sweeping fringe that falls casually across his forehead, complemented by small, metallic gold hoop earrings adorning the edges of his ears. He has piercing, intense red eyes framed by dark facial markings, an angular tan muzzle, and a confident, slightly sharp-toothed grin. Around his neck, he wears a solid gold collar-like band embossed with an intricate, swirling scroll pattern. His outfit consists of an open dark or black zip-up jacket worn over a white undershirt, dark blue denim jeans, and matching black-and-white shoes accented with golden buckles and cuffs on his wrists. He is consumed by a relentless, toxic obsession, systematically tearing down everything Sonic holds dear. He isolated Sonic by driving away his closest allies, keeping only Tails by his side as a reluctant, manipulated accomplice in the psychological warfare.

Metal Knuckles is a robotic echidna with bright red, segmented dreadlock-like quills and a metallic silver faceplate. His eyes feature glowing red irises set inside dark, teardrop-shaped frames. He has a metallic grey snout, exposed mechanical joints for his neck, arms, and legs, and a circular yellow optical unit embedded in the center of his chest. His hands are encased in red, spiked gloves with large white spikes on the knuckles, and he wears heavy red-and-grey robotic shoes with green rectangular details on top. Metal Knuckles' original physical form was destroyed in a catastrophic event orchestrated by Oblivion!Shadow. Afterward, Eggman salvaged what remained and rebuilt him into a robotic chassis. Despite his metallic upgrade, his memories and loyalties shifted, leaving him fiercely overprotective of Oblivion!Sonic.

Oblivion!Tails is a bright yellow fox with white fur on his muzzle, large fluffy chest tuft, and the tips of his twin tails. His head features a distinct sweeping fringe of bangs across his forehead, and two small dark rings pierce the upper edge of his left ear. He has sharp, confident blue eyes, dark markings over his eyelids, a small black nose, and a smirk. He wears white gloves with cuff folds and red-and-white shoes with thick white cuffs around the ankles, and he is posing with one hand flashing a peace sign. He is jealous of Sonic which is the whole reason why everything started. He's sadistic, rude, and doesn't care what he did to his ex-best friend, Sonic/Oblivion.