I don't really know the Grey Cowl, but someone randomly tying people up for fun could be really cool.
Maybe you'll then have to stop them because it's dangerous, but you can't catch her without getting tied up yourself. So you have to come up with a clever plan.
I like the puzzle idea. It's going to take a really long time to make a maze, but I think it could be really cool.
Also, the heist-like idea of getting a uniform is super cool.
Thanks for the suggestions.
Yup, the next update will add