In Invincible, most of the Viltrumites have no qualms about mating with humans to produce offspring that will eventually become the new Viltrumite Empire. Some of them have even fallen in love
Viltrumites (Team) - Comic Vine
Earth's Viltrumites | Invincible comic, Image comics, Comic books art
General Kregg - Image Comics - Invincible - Character profile - Writeups.org