Lucidstuck I

>Emily: Explain to him that all he needs to do is to allow you to place your hand upon him, this will allow him to leave this world.

I'm sorry, but i'm unseconding the motion to Exorcise him. If he was in pain like the other monster, i'd be all for it like a form of euthanasia. But as it stands, he'd be more useful as an ally, rather than leveling-fodder for Emily.
I mean, we even have a weapon for Emily, it's not like we even need his stuff. And with Audrey's cache of souls, leveling Emily shouldn't be a problem.

And then there's also the issue that abusing the kid's powers to kill monsters would be playing into Malice's hands. After-all, exorcising Sharkbite for no other reason than to take his stuff and soul isn't exactly morally justifiable...

>Emily: Have the reaper kids tell Sharkbite how they were saved by Nightmare and to emphasize how disfigured they started becoming over time. Also be honest about how you can purify monsters of their dark form, but only if they find strong enough reason to want to stick around, otherwise they will merely depart for the afterlife.

This way if Sharkbite REALLY wants to go, he can choose to do so on his own volition without straining Emily's conscience.

EDIT: Added Cf's suggestion.