The Ferryman” or “The Shadow” is an anti-villain in Little Nightmares. His job is to search the globe to hunt down children and bring them to the Maw. It is unknown at the time wether he works under orders from the Maw, or if he is sneaking the children onboard illegally. He appears in the 2017 Little Nightmares comic.
Though not much is known about him currently, some information can be surmised. He appears to have to power to shapeshift, as he is able to disguise as the sister of one of the children from the comic. He does not appear to hold ill will towards children, and perhaps may even be trying to help them, as seen when he rescues a child from the North Wind.
Note: The idea that this character is also the Wax Bellman has been debunked.