
Omni-Man, born Nolan Grayson, is the deuteragonist of Invincible. Introduced as Season 1's chief villain, this mighty Viltrumite came to Earth to prepare it for conquest, yet decades among humans slowly turn him into a father chasing redemption and an enemy of his own empire.
As a young Viltrumite Nolan went clean-shaven, his jet-black hair framing a lean but muscular build that makes him look much like his firstborn. Grown, he shows the towering, heavily built frame typical of Viltrumite men, roughly six foot two, fair-skinned, blue-eyed, his short black hair paired with the thick mustache his culture expects. Nearly a millennium old, he still reads as middle-aged, faint lines on his face and streaks of grey at the temples above a powerful body.
Across the centuries his wardrobe shifts with his role. For ages he wore the empire's plain white uniform before settling into the famous Omni-Man suit, its top white and its lower half red, finished with a cape, red-accented boots, color-inverted gloves, and a large red O on the chest that reworks the three-barred Viltrumite crest. Other looks include a white-and-grey spacesuit, everyday shirts and slacks on Earth, a stripped-down hero costume during his rule of Thraxa, and a grey prison outfit. Joining the Coalition, he takes up a white suit whose shoulders are capped in red, a long crimson cape hanging behind him, a small Coalition badge at the chest, the fabric ending at mid-calf and leaving his feet bare.
Bred to uphold Viltrumite doctrine, Nolan spent his youth hammering strength, discipline, and survival into younger generations, ruling through fear and even threats of death. Steadier than most of his kind yet no less merciless, he was forged by a mother whose brutality tested him and a father whose measured praise left a thin opening for compassion. When the Scourge Virus ravaged Viltrum he buried his grief and cleared away the dead, kin included, letting sorrow pass almost the moment it rose.
On Earth he wore the mask of a heroic guardian and loving family man while quietly softening the world for invasion, certain his species reigned supreme. He butchered the original Guardians without a flicker of regret, viewed humans as beneath him, once called Debbie little better than a pet, and would have killed Mark had the boy defied him. Still, two decades of family life opened a rift he could not close, and after nearly beating his son to death he abandoned the planet rather than press on. From there comes a gradual turning: despair and thoughts of ending his life, surprising sorrow for the Thraxans he grows to shield, and cell-side talks with Allen the Alien that leave him at peace with who he has become and hungry to set things right.
Nolan reaches Earth as a decorated Viltrumite soldier charged with readying it for the empire's expansion, masking his true errand behind the Omni-Man identity and an ordinary human life. When Mark's powers surface he sets the plan in motion, turning on and slaying the Guardians of the Globe, but his savage fight with his son ends with him unwilling to land the final blow, and he walks away from both mission and world. Adrift and suicidal in space, he rescues a band of Thraxans, comes to rule their planet, and raises a family with Andressa, until a Viltrumite strike team forces him to stand beside Mark in battle.
Seized and marked for death, Nolan is freed by Allen the Alien and casts his lot with the Coalition of Planets, feeding them tactics and weaponry against Viltrum while insisting the feud is his alone. He wins trust by apologizing openly, a thing his people find unthinkable, then goes home to enlist his sons and mend things with Debbie. His might ranks near the summit of his race, even with Conquest and short only of Thragg, backed by flight, near-invulnerability, tremendous speed, swift healing, and lifetimes of lethal skill, everything he ultimately turns on the empire through the Coalition's war and the shattering of Viltrum itself.

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Omni-Man, born Nolan Grayson, started as Invincible's antagonist, secretly working to prepare Earth for Viltrumite conquest, but years living among humans push him toward redemption, and he eventually turns against his own empire by joining the Coalition of Planets.
No, Omni-Man is not 3000 years old. As a Viltrumite he ages far more slowly than humans and is centuries old, far older than his human appearance suggests, though an exact age is never stated.
Omni-Man was not exactly turned evil, he was raised under Viltrumite doctrine and secretly sent to conquer Earth from the start, masking his mission behind a heroic identity until his true nature was exposed when he killed the Guardians of the Globe.
Omni-Man is one of the most powerful Viltrumites, ranking near the top of his race alongside Conquest, but he falls short of Thragg, who remains stronger.
Omni-Man leaves Earth after a brutal fight with his son Mark ends with him unable to deliver a final blow, at which point he abandons both his conquest mission and the planet, adrift and suicidal in space before he goes on to rescue and later rule a group of Thraxans.
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