Born with two real tails, he was despised and bullied by everyone, he has blue eyes,The fur fairly bright orange. The two-tailed fox, smart, cunning and most dangerous. He escaped by himself and used his genius intelligence to create 7 sharp and flexible mechanical tails to protect himself because he only believed in himself and no one else.

Aloof, cold and dangerous personality but has a genius mind and is good at creating many impressive inventions.He is Sonic the Hedgehog's best friend. He often hid himself in the underground laboratory near the railway tracks to avoid attracting attention.

Mr.Dr. Eggman, Dr. Babble, Dr. Deep, Dr. Don't, Dr. Done-It (Robotnik) are his enemies. Nine sadly recalls the past when he was walking and accidentally saw some girls' tails or looked at other people's tails, they got upset and beat and insulted him because he had two tails instead of one and said that a two-tailed freak like him didn't deserve to see anyone's tail...