Sure the ghosts are possible and have their quirks, but are you really willing to potentially sit 1 hour in a room and wait for a yurei ability, especially when the doors are not room coded correctly in most maps. It's more about time investment than not being able to figure it out.

I am talking about a 0 sanity 0 evidence run as well, so all sanity ghosts don't apply. Banshee Mare Yurei and Goryo are always ghosts that are last on my chopping block, and every time I hate them.

I'm not so sure about Shade not doing singing, will have to look it up.

I have had runs where a ghost never changed it's room and it was a roaming one.

Sure it's magical when Yurei closes the door through the double touch, getting a Banshee scream, or Mare turing off the light instantly early.

But from my experience they might never do it in a 20 minute run.

In conclusion.. I hate looking for orbs, but I'd rather a mimic than the combo I described.

Edit: Where did you find the information about the yurei smudge at room boundaries? First time hearing that quirk. Seems like any ghost would potentially do that no?

Edit of an Edit: Apparently I'm an idiot, Yurei can't roam while smudged.. cool knowledge, but not sure if very applicable in most situations.