Hah! Yes. That's... definitely more apt than emo!drunk!Riku. I could definitely see him getting cheery and affectionate in a way that his reserve prevents him when he's in full control of his faculties. Since, IMHO, he clearly *does* feel things very intensely, he's just too... well, introverted to show it.

(and breaking Sora's brain, yeeerrrsssssss.)

....

Now I want to write happy drunk Riku myself. CURSE YOU. :D