Wearing a yellow and black suit complete with a flowing cape, full-face cowl exposing only his mouth, and shoulder-length black hair, Sinister Mark is a dark mirror of Earth's protector. Arrogant, sadistic, and unhinged, he serves no Viltrumite Empire—only his own ego—viewing human life as trivial playthings. he started as a legitimate hero on his Earth, but after losing his loved ones and realizing his godlike strength, he corrupted into a tyrant who conquered his world for pure thrill killing He’s father Omni man in he’s universe Wanting new targets to terrorize, Sinister Mark struck a deal with Angstrom Levy to participate in the Invincible War. Angstrom granted him passage to the prime universe, and in return, Sinister Mark unleashed absolute carnage across Earth during the invasion, destroying cities, fighting defenders like Firebreather, and ruining the real Mark Grayson’s reputation by showing the world what an evil Mark looks like.

Mohawk Mark sports a sharp, dark mohawk hairstyle and wears a dark blue and black variation of the Invincible suit with short sleeves, exposing his bare arms and leaving his face completely uncovered. Arrogant, cruel, and fiercely loyal to Viltrumite doctrine, he believes strength dictates authority and holds deep contempt for humanity's perceived weakness. Mark yielded to Nolan or agreed with his father's Viltrumite ideology early on, leading them to conquer Earth together. As a direct descendant of Lord Argall, Mohawk Mark eventually rose through the ranks to claim rule over the empire as Emperor. Seeking to expand his dominion and crush any heroic versions of himself, Mohawk Mark struck a deal with Angstrom Levy to join the Invincible War. In exchange for dimension-hopping transport, he used the invasion to butcher Earth’s defenders, flex imperial Viltrumite superiority, and completely tear down mainstream Mark Grayson’s heroic reputation.

Clad in the traditional white, gray, uniform of the Viltrum Empire, Viltrumite Mark is a cold and disciplined warrior stripped of any human identity. Arrogant, ruthless, and fiercely loyal to imperial doctrine, he holds absolute contempt for human weakness and operates strictly on the Viltrumite belief that the strong are destined to rule over the weak. Unlike variants who fought for Earth, he was raised directly under Viltrumite authority in his dimension, fully embracing his alien lineage at an early age while completely shedding the "Invincible" moniker and any heroic ideals. Seeking to expand his reach and enforce imperial rule, Viltrumite Mark struck a deal with Angstrom Levy to join the Invincible War. Transported to the prime universe, he unleashed absolute destruction upon Earth’s cities, slaughtering defenders to showcase undisputed Viltrumite supremacy and utterly destroying mainstream Mark Grayson’s heroic legacy in the eyes of the public.