Yes to Daryl if you think that's what the darkness in his heart looks like. And yes other characters can see and deal with all others' otherworld monsters as long as they're on the fog part of the ship.
does the ability to make a silent hill monster take on the appearance of the character's self still count? ritsuka has a lot of crap wrapped up in identity issues/being told he's not the "real" ritsuka
it okay to send characters back home to a slightly earlier canon point than the one they're actually being played at? Not to change the past or anything, but just because they're dead at their real canon point.