Luke drinking hot chocolate instead of Corellian ale alcohol is totally Luke though.

We all now Princess Leia and Han probably drink a lot of star wars beer,lol.

Luke never touched a drop supposedly until what when he was going to get married to mara jade, and went to a bar/cantina with Han. After the Vong war i bet you he became a heavy alchoholic.lol.

Now Han going to a bar and getting into a barfight with Chewie by his side after an all night drinking binge is totally his style. Luke was the goody goody, Self rightious prude. the innocent farm boy, the pure hero. A least before he left Tatooine. Han was always a shades of grey character while Luke was the pure white, and vader the all black. Speaking of White and Black or good vs evil.

Empire hinted at Luke's darkness.

Han Solo the world weary smuggler, gambler, thief cheat and con artist. The Cynic. The cocky guy who thinks he has all the answers.

Luke the innocent and nieve farmboy who refusing the call to adventure has is thrust upon him by the death of his aunt and uncle and the arrival of the droids with the stolen plans, and Ben Kenobi's revelation that Luke's father was a jedi hinting at greater things for Luke than being a moisture farmer.