The Blurb walks towards Isaac and fires a chaotic burst of tears if they get close. After firing their tears, they act like regular Gapers and chase Isaac, attempting to deal contact damage.
The Deep Gaper pops out of the water and chases Isaac. It has a chance to spawn with a Small Leech attached, which will detach when the Gaper is killed.
The Wraith chases Isaac. It is detectable only by its reflection and the ripples in the water, and the occasional lightning that makes them briefly visible.
The Coal Boy walks towards Isaac, periodically firing several hot rocks towards Isaac, some of which may be Coal Spiders. Hot coals linger and can hurt Isaac.