Watched the LEGO Batman movie a few days ago. It’s one of those movies where I like the characters more than I like the movie itself. A lot of the jokes fell flat for me and it had some really out of place emotional scenes that were a bit cringe, but watching the characters just mess around and do stupid stuff was fun.
The only “emotional scenes” that worked for me were the Batman/Joker ones, and yes, the slash is entirely appropriate. With sentences like “I don’t currently have a Bad Guy. I like to fight around” from Batman, to the Joker fondling himself when telling Batman that he “can’t fight any of thiiiis anymore” it’s clear what the movie makers were going for. Heck, Batman even says “I don’t do ships!” when the Joker talks about their “special relationship”. All those scenes just get better the more ridiculously emotional they get.
My favorite part was the K-Pop music video at the end, specifically Robin and Joker’s costumes, hence the white glitter. (Apparently Joker is part of the Bat Family after he and Batman makes up?)