He's based off the king who became a judge of the dead in the afterlife, I gave him bull horns because all my demon OCs have horns and according to some sources the mythological Minos was also conceived from a bull (a form Zeus had taken) and a human woman (Europa). My OC Minos does also have a minotaur that he can summon as well.
...My understanding was that it was Minos' stepson who was conceived by the Zeus-bull, not Minos himself, hence the confusion! But thanks for explaining that the horns are a your-OCs-in-general thing.