Vanilla, cream, and… you?

Gemerl: Gemerl has a black, yellow, and gray body, red and blue eyes, and what appears to be a third eye like the one Emerl had when he absorbed a Chaos Emerald. Emerl's eye would open, but Gemerl's is modified, becoming a jewel instead of an eye. Unlike Emerl, he also possesses a jetpack that allows him to fly and/or increase his speed. He is the same height as Emerl.
It is a robot created by Dr. Eggman using Emerl's data, making it an improved version of its predecessor. Emerl helped the doctor in his attempts to stop Sonic and his friends from thwarting one of his plans, but ended up betraying its creator to sow chaos. After its defeat, it was reprogrammed in the image of its predecessor, and then reprogrammed again to protect Cream the Rabbit and Vanilla the Rabbit and their Chao.

Shadow the Hedgehog: a hybrid being created from a black anthropomorphic hedgehog/Black Arm. Shadow was created as the Ultimate Life Form.
Shadow is a black, anthropomorphic hedgehog with red stripes on his quills, around his eyes, and on his arms and legs. He has red eyes, a patch of white fur on his chest, and a brown snout. He has six quills on his head, four of which curve upward and two that curve downward, two quills on his back, and a small tail. For his attire, Shadow wears white gloves with black cuffs and red tabs, and his Flying Shoes, which, like his gloves, have black cuffs and red tabs. On each of his wrists and ankles, he wears a golden Power Inhibitor Ring to prevent him from wasting his energy.

Sonic the Hedgehog: He is an anthropomorphic hedgehog born with the ability to run faster than the speed of sound, hence his name. His best friend is Tails.

Since beginning his battle against injustice, Sonic has been victorious and is recognized worldwide for saving the world countless times. Throughout his many adventures, Sonic has traveled from the ends of the earth to the farthest reaches of space and time, facing countless trials that have pushed him to his limits, earning him numerous titles, allies, and the scorn of many enemies. He is known for his legendary cocky yet calm demeanor, as well as his short temper and strong sense of justice. Sonic is compassionate and has a great love for freedom and adventure. He uses his abilities to protect the innocent of his world and beyond from the forces of evil, especially his archenemy, Dr. Eggman, and his empire.
Sonic is a slim, anthropomorphic hedgehog with blue fur. His fur covers most of his body except for his snout, arms, and the insides of his ears. His skin is peach-colored on his snout, arms, and the insides of his ears. Although it may not look like it, the peach-colored patch on his stomach is fur, not skin. He has six long quills on the back of his head, two spines protruding from his back behind his shoulders, and a short tail.

Miles "Tails" Prower: He's a small, anthropomorphic fox with two tails, which allow him to fly (thanks to their rapid spin) and swim. Thanks to his ability to fly and his considerable speed, he became Sonic the Hedgehog's best friend and adventure companion. Combined with his high intelligence and excellent mechanical skills, Tails is a great partner on their adventures, always helping others with a humble attitude.
Tails is an anthropomorphic fox with two orange tails covering most of his body. He has white fur on his muzzle, four whiskers on each side, his torso, and the tips of his tails. He also has a three-strand fringe on his head and light blue eyes. He wears two red sneakers with white toes and cuffs, a pair of white gloves with cuffs similar to those on his sneakers, and two black bracelets on his wrists and ankles. He is Cream's boyfriend.

Amy Rose: Amy is in love with Sonic, to the point of declaring herself his girlfriend. Besides her fascination with the blue hedgehog, she believes he has a good heart and admires him as a great person. Amy can be a bit eccentric, but she's kind, and messing with her can have consequences. She enjoys playing with Tarot cards.
Amy is an anthropomorphic pink hedgehog with emerald green eyes and peach-colored fur on her muzzle and arms. Her pink fur is usually pale or light, though in some appearances she is depicted with a bright pink (Sonic Generations and Sonic Unleashed). Her quills point downwards, similar to a bob haircut. She wears a red headband, white gloves, and gold bracelets. Like Tails, she has three quills on her forehead resembling bangs. She apparently wears mascara. Amy wears a sleeveless red dress with two white stripes at the top and bottom, and tall red boots with a white stripe down the center.

Blaze the Cat: Blaze is a lavender-furred cat. She wears her mane tied in a high red ponytail with purple tips. She wears a purple vest with a dark pink stripe at the waist and a gold trim around the collar, which also appears to have fuzzy fabric at the ends of the sleeves. Her gloves are white, and she wears tight white pants. She has scarlet red high-heeled shoes with a white stripe and gray soles. She has white fuzzy ornaments on her ankles, similar to those on her wrists. Her eyes are gold, and she appears to wear mascara. She has a red jewel on her forehead. Blaze also has a cat tail with sharp, purple tips.

Vanilla: She is an anthropomorphic rabbit and the respected mother of Cream the Rabbit. Vanilla lives with her daughter, Cheese, her companion Chocola, and Gemerl, and runs a successful Chao Garden with them.[3] Vanilla is a skilled homemaker who has taught her daughter polite manners through her kind but strict discipline.

Cream: She is very polite, kind, and pure, although she can sometimes be childish, shy, and naive. She is very curious and tries her best in everything she does. Despite her young age, she isn't afraid to stand up for herself and is always willing to help her friends. Her willingness to help others has allowed her to have more adventures with Sonic and his friends, showing that she is growing into a heroine like her best friend, Amy Rose.