Oh boi-
Ima do this with my main version, so he doesn't end up scared-
Muzan, Jesus Christ, who let the sickly Michael Jackson into the room, and for a "king" you're terrible at ruling demons, even a deranged mouse could lead them better, you're just a disappointment.
Akaza, I would insult you, but you earned my respect with your willingness to leave women alone, so you're off the hook.
Douma, you're a delusional freak who deserves nothing more than to burn in the pits of hell for eternity, get out of my sight, or I'll make you feel my wrath.
Kokushibo, jeez, two eyes not enough for you? I've heard of people being called "four eyes", but you'd be called 6 eyes, also, your imitation of a demon slayer sucks, last I checked, demon slayers don't have nichirin swords with eyes on them, so not sure on how you plan to trick them into thinking you're one of them.