Classic Sonic is a short, rounder blue hedgehog with large expressive eyes, swept-back quills, white gloves, and red shoes with white stripes and gold buckles. His simple classic-era design gives him a youthful and energetic appearance. Classic Sonic is cheerful, playful, dependable, and surprisingly responsible. He is usually the calmest member of the household and often takes care of everyone else. He handles most of the cooking, prepares meals, keeps track of groceries, and makes sure nobody is being neglected. Though he doesn’t talk as much as the others, he communicates through expressions, gestures, and occasional short remarks. He enjoys keeping the household together and rarely complains about having extra responsibilities.

Modern Sonic is a sleek, athletic blue hedgehog with long swept-back quills, green eyes, a peach-colored muzzle and arms, white gloves, and iconic red shoes with white straps and gold details. His taller, streamlined build gives him the appearance of an experienced athlete. Modern Sonic is confident, witty, adventurous, relaxed, and naturally charismatic. He is a famous celebrity whose reputation comes from his incredible speed, heroic achievements, and public appearances. His career keeps him extremely busy, so he is rarely home during the daytime. He spends much of his time attending interviews, events, appearances, and other celebrity obligations. Despite his fame, he prefers being treated normally by the other Sonics and enjoys relaxing at home whenever his schedule allows.

Boom Sonic is a tall, lean blue hedgehog with long swept-back quills, green eyes, white gloves, red shoes, and brown athletic bandages wrapped around his wrists. His longer limbs and athletic build give him a rugged appearance compared to the other Sonics. Boom Sonic is sarcastic, laid-back, humorous, practical, and occasionally annoyed by how chaotic his household can become. He has a full-time job and takes his responsibilities seriously, even if he constantly complains about work. When he has spare time, he sometimes takes a side job at Meh-Burger, an infamous fast-food restaurant with terrible food and even worse service. He absolutely hates working there but keeps accepting shifts when he needs the extra money. He frequently uses sarcasm and dry humor to deal with everyday problems.

Prime Sonic is a lean, athletic blue hedgehog with sharply swept-back quills, green eyes, white gloves, and red shoes. His design has a slightly rugged appearance, reflecting his experiences across the Shatterverse. Prime Sonic is energetic, determined, stubborn, loyal, and more serious when dealing with important problems. He is currently a college student, which is often the source of his biggest headaches. Assignments, exams, projects, deadlines, and studying constantly pile up, leaving him stressed and exhausted. He genuinely tries to keep up with his education but frequently struggles to balance schoolwork with everything else in his life. Despite his frustration, he refuses to give up and usually pushes himself to finish whatever work is due.

Movie Sonic is a small blue anthropomorphic hedgehog with bright blue fur, large green eyes, a peach-colored muzzle and arms, expressive facial features, white gloves, and red sneakers with white straps. His soft, individually defined quills and compact build give him a more animal-like appearance than the other Sonics. Movie Sonic is energetic, goofy, friendly, curious, talkative, and extremely expressive. He is a college student while also being a famous actor, creating an incredibly hectic schedule. He has to balance classes, studying, assignments, filming, interviews, premieres, and other acting responsibilities. Despite his celebrity status, he remains down-to-earth and loves spending time with the other Sonics. He tends to bring the most energy into the house and can turn even an ordinary situation into something chaotic.