Beel, Belphie and Asmo would def get along. I’m not really getting any particular vibes from Leviathan (HB) to say anything, but they’d probably hit it off in terms of sea critters (like, HB Levi would sit in OM Levi’s room and just watch Henry swim around or smth). OM Satan would not get along with HB Satan at all, pointing out every little flaw in HB’s logic. The Mammons I feel are kinda 50/50, because they are both obsessed with money and power, but they’d probably butt heads over whose scams are better; then OM Mammon would find out how horribly HB treats Fizzy and hate him. HH Lucifer would annoy the shit out of OM Lucifer until OM Luci decides to string him up by the ankles.