Blank sign-ups on purpose are sort of mean, but I'd be fine with only getting characters, DNWs, and favorite tropes. I've certainly written assignments with less information to go on than that.

I'm also leaning toward no letter this year, though not as a social experiment. My plan was to be pretty descriptive in the sign-up itself. I don't even use the letter post for treats anymore, since all of the sign-ups are released into the wild after assignments are out and I've never been one of those people who writes treats before my assignment is done.