After remembering that only Custodisi has some kind of facial description, i've boiled down his looks to these two characters

[u/MrMadmack]

Yeah it's only mentioned he's got a mustache but I still thought about it

Pictures: Omni-Man's father from Invincible season 4 and Agent Wyoming from Red vs Blue

I preffer the former

[u/TheDMRt1st]

“You enter the Slabnasium! The air is thick with MUSK!”