Did you know Louis has a Harley tattoo on his back? He does, the exact image you see up and to the left there, on his right shoulderblade. It was his first (and so far only) tattoo. She's his all-time favorite girl, with me being a "within shouting range" second.
I don't mind. In all honesty I think I've been a fan of hers for at least as long, if not as intensely--I can remember watching the Batman animated series after school, and some of the storylines have stayed with me to this day. (It turns out, most of the ones I remember were written by Paul Dini, the creator of Harley Quinn--not surprising.) One of my favorite episodes is Harley's Holiday. I don't think I would've bothered to do this costume if she weren't Louis's favorite, but I certainly don't mind running around in it. Luckily, DC bothered to put out an official costume that I was able to buy online--I shudder to think how much this would've cost me to have made.