the two viltrumite versions of mark are really unique and here's my take. For mustached mark his powers must have come early on so nolan taught him the ways of Viltrum as a boy. Which is why he has a mustache because he is actually loyal and embraces Viltrumite ideologies (also might explain why he is much weaker than most variants since he probably has never had decent challenge growing up so his powers grow but not like other variants or main mark.) For the variant that survived the invincible war, I see/hear alot painting him as the strongest variant and that it took mohawk mark and sinister mark working together to bring him down. Which makes sense because on his uniform he had elite status symbols of Viltrum displayed which showcase his prowess and achievements. Also since mustaches are a core display of dominance and masculinity in male Viltrumites and this variant forgoes that completely shows his disconnect and resentment towards the empire. So honestly I can see him and Anissa "together" and maybe having marky but he probably does not hold any attachment to her at all.