Algebraliens.

X - He has yellow hair and light yellow eyes. He is kind, sweet, appreciative, forgiving, friendly, and good. He has a friend, Four.

Zero - He also has light gray hair and dark gray eyes. (Please don't confuse him with Eight!) He is impatient, toxic, and serious.

Nine - He has white hair and white eyes. He wears black glasses and loves skateboarding. He acts like he's cool, but he can be sensitive sometimes.

Eight - He has light gray hair and gray eyes. He is calm, cynical, and tired, but mature.

Seven - He has gray hair and gray eyes. He is sociable, cheerful, stubborn, slightly selfish, and indifferent.

Six - He has blue hair and light blue eyes. He is a little mean, and he is friendly.

Five - She has lilac hair and violet eyes. She is a bit narcissistic and serious.

Four - He has blue hair and blue eyes. He's a bit arrogant, moderately rude and humorous, quite cruel, and he has a friend named X. He also has an enemy named Two.

Three - She has red eyes and light red hair. She loves to help others and is friendly and kind.

Two - He has green hair and green eyes, and has an enemy, Four. He is friendly and optimistic, but also sometimes arrogant and slightly sadistic.

One - She has cornflower-blue hair and cornflower-blue eyes. She's quiet, calm, and manipulative. And she has no friends because everyone ignores her. (And some even just pretend she doesn't exist.)