Milkshake Bar: Ren & open
Costumes weren't a thing that Ren typically did, but since there was a hero theme, and because he figured it might matter to Audrey - whom he liked - and maybe less to Hannah - but it was her party - he'd racked his brain for something as he'd worked at the bookshop because it wasn't as if he had time to make anything. And in the end he'd seen a superman comic in the used box brought in, and he'd decided he could do that. Well, or Clark Kent anyway, and so he'd knocked the lens out of a pair of reading glasses, put on a white button up shirt, and colored up a Superman logo on a sheet of paper that he pinned to his t-shirt underneath. Sadly, he'd gotten the yellow and red reversed, because he hadn't been looking at it, but so far nobody had mentioned that to him. It peeked out from under his shirt, just barely a costume, really.
Right now he was staring at the milkshake bar possibilities. He hadn't had one in years, and figured this was as good a time as any to go for it. And also, he hadn't had milkshakes at his - sort of - open house New Years thing he'd done back when he'd moved into the neighborhood and obviously he'd missed out.
There was chocolate ice cream which was an obvious choice, but then there was the question of if he added anything else or just straight up chocolate.