I always thought of drunk Levi and Eren to be for the most part, their own opposite. It’d be much harder to get Levi drunk, but he's smiley and giggly and cuddly and slurs his words, so it's worth it. Eren would be rather calm and serine and hiccup a lot and just kinda want to sleep but always helps drunken Levi fill his snuggling quota. Nobody would tell either of them that they're like that and If one's sober and the other's drunk, they wouldn't tell either. But they both think it's adorable.