As those who filled out Muraki's permission post may recall, he has the ability to seal up someone else's memories and reopen them at a later date. Since he has no idea if his abilities will work in other worlds, he'd like to figure this out. Getting to other worlds won't be hard -- he canonically can teleport between the lands of the living and the dead, so he can travel on his own here -- so he just needs test subjects. This is where you all come in! If you've talked to him, or want to talk to him in the future, and are okay with your character getting a 10-15 minute gap in their memory, let me know. Nothing bad will happen in that lost time; Muraki will visit the character, talk to them about their world or other simple topics, close up the memory of his visit, and vanish leaving only a couple of white feathers behind. Your character will become alert as or just after his disappearance.
I'm also open to this not working perfectly on characters with particularly strong magic or mental abilities of their own. In that case, they might remember a tall man in white or other details that don't completely reveal his identity. And if these memory gaps are posted to the community, others investigating is fine with me. Again, I'd rather he not be discovered yet though. He'll work up to doing other (bigger and worse) things if I keep him here for a long time.
Is anyone interested in this?
[PS-- If you haven't filled it out, it's here and makes my life a lot easier. There's also an opt out post in his journal if you want nothing to do with a raping, murdering, blackmailing Complete Monster, to reference TV Tropes.]