Touhou fans, at least the vocal ones on /jp/ and /touhou/, tend to think anything is suddenly funny if it has Touhou in it, and spout the same retarded shit all the time. Walfas isn't funny, Cirno doing stupid shit isn't funny, roleplaying as Touhou character is just fucking stupid.
I love the games and have my share of Touhou doujins, but they were a cancer on old /a/. Geass is starting to delve into this with the rise of the roleplaying tripfags, but Geass posters have a better sense of humor that Touhoufags do. And trust me, that's not saying much.