Male. Green eyes. A blue hedgehog beastman. He is extremely fast and can run at the speed of sound, making his combat ability quite strong. He wears a knee-length white dress shirt and white slippers. He has strong bonds with all his teammates and a wide social circle. He is especially close to Amy (he might even like her). When being experimented on, he gets flustered and thinks of his friends. Once it's over, he returns to his sly self. The test subjects for his experiments are speed, strength, and energy. He is 100cm tall and weighs 35kg. His build is slightly large but thin.

Male. Purple eyes. A red echidna beastman. He wears large white gloves, a white T-shirt, and white shorts. He is the only one who is barefoot. He is fast, though not as fast as Sonic. He is the strongest in Team Sonic and highly competitive, but he is also simple-minded and easily deceived. When being experimented on, he resists so violently that a dozen researchers have to hold him down. The test subjects for his experiments are grip strength, power, and mental fortitude. He is the tallest in Team Sonic. He is 110cm tall and weighs 40kg. His build is somewhat large but thin.

Female. Green eyes. A pink hedgehog beastman. She wears a long, knee-length white dress shirt. She wears a white cloth headband, long white socks, and white slippers. She has a crush on Sonic. She is fast, but not as fast as Sonic. She is skilled at wielding the Piko Piko Hammer (a very large hammer). She is the best communicator among Team Sonic. Surprisingly, she is calm when being experimented on (perhaps because she's been through it so much?). The test subjects for her experiments are grip strength, heart, and mental fortitude. She is 90cm tall, and her weight is said to be a secret (even though she has a thin build).

Male. Red eyes. A black hedgehog beastman. He wears white slippers and a long, knee-length white dress shirt. He has white chest fur (which peeks out from the collar of his shirt). He has red stripes on his black fur. He looks similar to Sonic and is also fast with very high combat ability. While he seems like he wouldn't talk much to the team, he actually communicates quite well (especially with Tails and Amy). When being experimented on, his resistance is so strong that twenty researchers have to hold him down—more than Knuckles. The test subjects for his experiments are energy, speed, grip strength, and mental fortitude. (Because he is the strongest and most dangerous, the researchers handle him with the most caution and brutality.) He is 100cm tall and weighs 35kg (same as Sonic). His build is somewhat large but thin.