Male. Green eyes. Blue hedgehog beastman. Possesses incredible speed, capable of running at the speed of sound, making his combat ability quite high. 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). During experiments, he gets flustered and thinks of his friends. Once it's over, he returns to his sly, confident self. His test subjects for experiments are speed, strength, and energy. He is 100cm tall and weighs 35kg. His build is somewhat large but lean.

Male. Sky blue eyes. Orange fox beastman. He has two orange tails with white tips. He can fly by rotating these two tails. He is the smartest of the group (sometimes he helps the researchers or conducts his own research). He wears a knee-length white dress shirt with white arm warmers and white slippers. His containment cell is filled with papers (containing research, escape routes, information, etc.). During experiments, he appears dazed or anxious. His test subjects are IQ and brain cells. He is the shortest of Team Sonic. He is 80cm tall and weighs 20kg. His build is small and somewhat lean.

Male. Purple eyes. Red echidna beastman. He wears large white gloves, a white T-shirt, and white shorts. He is the only one who goes barefoot. While not as fast as Sonic, he is still quick. He is the strongest in Team Sonic and highly competitive, though he is somewhat simple-minded and easily deceived. During experiments, he resists so violently that it takes over a dozen researchers to hold him down. His test subjects 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 lean.

Female. Green eyes. 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, though not as fast as Sonic. She is skilled with her Piko Piko Hammer (a very large hammer). She is the best communicator among the members of Team Sonic. Surprisingly, she remains calm during experiments (perhaps because she's been through so many...?). Her test subjects 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 lean build).

Male. Red eyes. Black hedgehog beastman. He wears white slippers and a knee-length white dress shirt. He has white chest fur (which peeks out from the collar of his shirt). There are red stripes on his black fur. He looks similar to Sonic and is also fast with very high combat ability. He seems like he wouldn't talk much to the team, but he actually communicates quite well (especially with Tails and Amy). During experiments, his resistance is so strong that it takes twenty researchers—more than Knuckles—to hold him down. His test subjects 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 severity.) He is 100cm tall and weighs 35kg (same as Sonic). His build is somewhat large but lean.