In what circumstances does or would your character drink alcohol? (e.g. "with a meal, for fun, when depressed, at any excuse, NEVER EVER") Lelouch will drink over dinner or with dessert, or occasionally to be polite. He's a gentleman you know.
How much would they normally consume? Do they get drunk every once in a while, or live and breathe alcohol, or make sure to stay under the legal limit? It would take some real epic misery for Lelouch to be willing to lose control of his faculties, so he's always careful how much he drinks. ♥
How much alcohol tolerance do they have? Does even a sniff of alcohol knock them over, or can they guzzle alcohol without feeling impaired? Actually I think he's probably got a pretty good head for drinking! I doubt he'd drink anyone under the table, but he could have two glasses of wine and still be pretty solid.
What kind of drunk is your character? How would they act if they were drunk? Assuming that Lelouch let himself get intoxicated, I imagine him getting quieter as he drinks, because he can tell he's losing some control over his faculties, so he doesn't want to say too much and he doesn't want to look stupid, until he's just this guy in the corner playing with a napkin and wobbling a little.
...that or getting angry and ranting with grandiose hypersensitivity like a crazy man but that's not much different than his usual.
Who would they go drinking with if they had to choose drinking buddies? Suzaku. C.C. provided she shuts up. Tear could come too.
What's their alcohol preferences? Beer, wine, mixed drinks with fancy names? Wine. Almost always wine. But he will except fruity mixed drinks. (And I do mean fruity. *shot*)
Green alcohol y/n? Not even a little.
Your character is completely drunk. Who do they drunk-dial, and what do they say? Suzaku, even if Suzaku just dragged him home from the bar, and he would attempt to sound very calm and rational and maybe try and remind him of their to-do-list for tomorrow, and then slur out something like "Okay love you g'night" and pass out.