Omni-man

In spite of being thousands of years old, Omni-Man's physical appearance is portrayed as that of an individual in their middle age, exhibiting a commanding presence and possessing a well-built and powerful physique, notable for its broad body structure. He has a combination of black and gray hair, coupled with a black mustache, piercing blue eyes, and a resolutely masculine countenance. He is dressed in a complete bodysuit, in which the upper section is adorned in white while the lower section showcases a vibrant red color. It is worth mentioning that he adorns white boots, which are embellished with a solitary red highlight positioned at their center. In contrast, his gloves exhibit an inverse color scheme. To finalize his attire, he adorns himself with a scarlet cape. The attire showcases a prominent elongated crimson highlight embellishing its core, where a scarlet "O", symbolizing the titular individual, is prominently displayed.

Omni-Man, also known as Nolan, initially seemed like the perfect superhero. He was brave, caring, charming, loyal, and willing to sacrifice himself for others. He appeared to be a loving husband and father, although he had high expectations for his son. However, his true nature as a Viltrumite showed that he was ruthless and loyal to his empire. He believed it was his duty to conquer other planets and saw other races as weak and inferior. He didn't feel remorse for the terrible things he did and thought he was doing the right thing. But over time on Earth, he started to change. He felt uneasy about his actions and began to care more about his family. In a fight with his son, he realized the love his son still had for him, leading him to break down and leave Earth, feeling guilty for what he had done. Nolan's time on Earth changed him and made him regret his past actions.

Born on the distant planet Viltrum into an imperialistic race of super-beings known as the Viltrumites, Nolan was indoctrinated with the Viltrumite creed of conquering as much of the galaxy as possible to assimilate other worlds, species, and civilizations into the Viltrumite Empire. Nolan joined the Viltrumite military forces as a young man and rapidly rose through their ranks through years of successful war and conquest. Eventually, the size of their ever-growing empire and their forces being spread thin prompted the Viltrumites to look for more efficient methods of galactic domination. To counter the raw man-power needed for a full-scale invasion into target planets, it was instead decided that the most trusted officers of the Viltrumite military would be assigned planets to weaken sufficiently in order to allow for a seamless takeover.

Nolan was assigned Earth and, as such, traveled there and created a new life on Earth, adopting the moniker Omni-Man and aligning himself with the original Guardians of the Globe and Global Defense Agency. Nolan also married a human woman named Debbie, and had his son, Mark.