Omni man. Invincible: Is Omni

Mark attempts to fight, but Thragg suggest they talk Nolan joined the Viltrumite military forces as a young man and rapidly rose through their ranks through years of successful war and conquest
Thragg releases Nolan and attacks Mark Kregg informs Nolan is in full health, that he will now be put to death

After realizing he loved Mark too much to kill him, Nolan decides to take over another planet, hoping to lessen his sentence for deserting the Viltrum Empire.

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Nolan Grayson
At the end of the 10th issue, one of the Guardians who was killed, the Immortal, lives up to his name when he returns to life and attacks Omni-Man
Omni
Thragg decides to let the duo live and they retreat from Viltrum
5 Reasons Omni
After fully healing from his injuries, Nolan brings Thragg before the other Viltrumite to serve out his sentence
Anissa interrupts and Mark grabs her by her neck Due to his race virtual immortality and indoctrination of Virtumite ideology, he seen many beings as weak and inferior and view their purpose to be conquered, if they resist, they are subjugated violently
Omni-Man approached him and told him he looked ridiculous, also mentioning that he had skipped a few steps since he had caused a lot of destruction Mark refuses to speak and he left the Warship

Yet both have the sociopathy of the Joker.

Invincible ending explained: Why did Omni
During that time, Nolan and Rex would become friendly with one another
Invincible: Is Omni
Although Omni-Man originally only pretended to be a defender of Earth, by the end of his story his fiction becomes fact with him becoming a real protector of the planet
5 Reasons Omni
Medical aid arrives along with Cecil and Debbie to save Mark and his mother his left in a state of grief over everything that happened