Four

He has sky blue skin, Black eyes, he has a ponytail, wears dark blue suit and a black tie, dark blue pants and black shoes.

178 cm

He has the personality of someone who's annoyed, a reserved type, determined, smart, sadistic, elegant, very calm and not so much of a nice guy as he may seem, he can be annoying, sometimes even evil to his victims or people who provoke or trigger him

Four is the main host of Battle for Battle for Dream Island and it's contestants are Firey, Leafy, Coiny, Tennis ball, Pin, Ruby, Ice cube, Golfball, Tennis Racket, Bubble, Gelatin and Barf bag. They compete against each other to win the prize of BFB at the end of the tournament. The object show is mostly organized by Four and X and the viewers sometimes help them choose who will be in the bottom five or who will be eliminated

He has an enemy, his name is Two, they do not get along at all, since it was revealed that Two stole 4's contestants from BFB and put them into TPOT, since then they have been enemies and try to defeat each other.

are colorful, genderless, sentient beings resembling mathematical symbols (mostly numbers) that originate from the "Equation Playground". They are notable for their appearances in "X Finds Out His Value" (XFOHV), "The Number Playground Chronicle!", The Power Of Two, and Battle for BFB. Their species is "algebralien", they are living beings with consciousness and limbs. each one represents a different number and in their world mathematics dominates, everything is mathematics but, One day the algebraliens take human form and become a powerful species.

Four is very powerful, he is one of the only algebralies who has powers, along with his enemy Two, can do everything

he is also a sadomasochist, he harms his enemies or others for fun, he also screech people if they bother him, he jumps of happiness and makes joy sounds when he feels it, he gets nervous when someone flirts with him, he has a tendency to dominate his fans or friends and make them follow him and listen to him as he is very narcissistic. and speak Spanish

X, One, Three, Four, Five, Six, Seven, and Eight, friends from "equation playground"