Put your name/mun journal/plurk/some form of way to 'check' on you on the profile page. It's very unfortunate that others don't have to do this, but if there's a way to associate the player to someone who's obviously not him, then that's a green light in my book. Example: your Shiki journal is joined to your musebox where you have active characters in other games, dating from at least a few months back. Hellion can't have presently active characters in games for more than a month or two, journal date creation (of any other muses you play that can be associated to you), game record, comment count are things he can't fake on the go. Same with plurk accounts, he can't have one older than a few months. As a player with my share of Tsukihime journals, I'm every bit as annoyed as you because I actively track the tag at d_m and would love to thread with anyone else interested in playing from the fandom, but I don't want to be wary of him every step of the way. I sincerely hope that this doesn't turn many people away though, but that's the best compromise that I sadly can think of. Again, sorry to hear, anon :( I'd thread with your Shiki!