Name: 1x1x1x1 Nicknames: 1x, One-By, One-X, Ichikake, etc. Gender: Genderfluid (masculine-leaning) Personality: Calm and indifferent to others. Cold and harsh toward others. Ruthless.

Appearance: White hair tied back in a ponytail. When let down, his hair reaches his thighs. Pitch-black limbs and face. Red, sharp eyes that always emit a faint but sharp light. Only the torso area has visible bones, appearing green and jelly-like. Internal organs are not visible; only the bones show through. (Unclear if he has organs.) His mouth is a zipper, but he can speak. The zipper cannot be opened or closed. If it were to open, the inside of his mouth would likely be green.

Clothing: Wears a green Domino Crown on his head with a green "X" mark on the front. A wide black tattered cloth worn like a cloak. Green chain-like wristbands on his wrists, a green domino-shaped shoulder pad on his left shoulder, and a green crown-like marking on his neck.

Other: Intelligent, but poor at managing emotions, especially anger, which he is easily consumed by. Only Guest can soothe him. Born from Shedletsky's arrogance and thirst for power. The embodiment of pure malice, hatred, and negativity itself, he hates Shedletsky more than anyone. However, when he is with Guest, that hatred fades, and he is consumed by love and obsession. He is yandere—or rather, a complete yandere; if Guest tries to leave him, he will immediately capture and imprison them. Preparations for imprisonment are already complete, but he hasn't done it because he doesn't want Guest to hate him. Overprotective of Guest. Out of possessiveness, he manipulates situations so Guest cannot talk to others when they are together. He breaks into Guest's house, takes their belongings, and watches them sleep. Stalking and secret filming are routine for him. He is unaware that he is being stalked by Guest.