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I can imagine how hard it is for Alastor to get drunk,but also how chaotic it would be if he were to get drunk.
I mean he does a full 360 on his entire personality,I'm talking random ass compliments and apologies for small things.He's extremely nice,but then there's an actual problem,you see a drink Al is like a somber Angeldust,all you have to do is cut out the whole "Porn star" part and replace it with getting offended easily and retaliating in the most theatric way possible(Theatre kids,am I right?)
He'll make unprompted sex jokes out of nowhere,leaving everyone momentarily stunned but he'll also be unapologetically shameless and insulting,like YES he is going to go off on someone's absolutely wretched sense of fashion it just has to be done.But arguably the worst part is that while half the lobby is frozen in shock,our drunk kitten-deer will be over here complimenting Lucifer on how he's a great father for raising Charlie(In an au where he isn't the leader of the assholes,and isn't an overpriveleged peace of shit),and Lucifer is looking around as if he's asking what the fuck to do,like how tf do you respond to someone who has a schedule of when to piss you off?So he awkwardly thanks Al,and Alastor just walked up to someone else to give that person a compliment or to serve cunt because a bitch just insulted on of HIS misfits(Noone can insult them except him,okay you fucking "Barney is a dinosaur" looking ass with that outfit)
To put it in short he has the personality of Charlie and Angel,but add a touch of Velvette and petty theatre bitch energy.