Ruin

""I'm Unruin-Immortal, you see. None of you negators unloved by God will be able to ruin my dreams.""

Ruin is a negator, self-proclaimed to be loved by God.

He's a known Regulator and has been named by Seal, the King of Negators.

Personality
Ruin is sadistic and mentally unstable, cheerfully slaughtering hundreds of people to make friends with the newly created UMA Ghost. He is a follower of God, and believes he is loved by him. Naturally, any affronts to this belief enrages him greatly, such as when Billy points out that his "Unruin" is actually a weaker version of Undead.

Ragnarok Arc
He first appears by stabbing Fuuko through the chest, stating that she isn't allowed to kill Undead. After Andy slices him in retaliation, he regenerates and flees, stating that the Negators will be unable to ruin his dreams.

He is last seen laughing manically along with Apocalypse as Sun appears to end the world.

Powers & Abilities
Unruin: He manages to get unscathed from any wounds he receives by nullifying the damage of attacks aimed at him. However, even though he is immune to damage, he cannot deny his death during the loop.

Shadow Portal: After taming Shadow, Ruin gained the power to appear and disappear within the shadows.

Blood Manipulation: After taming Blood, Ruin gained the power to manipulate blood.
 * Blood Wings: Through Blood's power, he can create a pair of blood wings that allow him to fly freely in the air.
 * Blood Clones: Through Blood's power, he can create clones made of his own blood to fight alongside him.

High Pain Tolerance: Unruin demonstrated a high resistance to pain, showing no reaction of discomfort when he was cut in half by Andy or when he was decapitated by Juiz, keeping his smile all the time.

Stealth Master: Unruin proved to be very stealthy when he attacked Fuuko from behind with Andy and the other negators only realizing his presence after he attacked her.