Rifleman

First appearance: Downrange (2017)
A group of teens run afoul of a masked maniac. Unlike normal teen exterminating masked manics, this one doesn't use cutlery or power tools or forestry equipment, he's got a rifle.
Weird variation on a slasher flick. I really liked the ending.

Joseph

First appearance: The Crescent (2017)

A woman and her child move into her mother's house to deal with the grief of losing her husband and to marble paper. Unfortunately for her there's some weird stuff going on around the beach.
A horror flick in the vein of EYES OF FIRE and MESSIAH OF EVIL.

Mrs. and Mr. Ryan

First appearance: Mom and Dad (2017)

For some reason parents have an uncontrollable urge to kill their offspring. Not ALL kids, just their own. Could it be some kind of attack on the country or the entire species! It doesn't matter, your parents will kill you.

Jötunn shape shifter

First appearance: The Ritual (2017)

Four friends go on a hiking trip to morn the death of one of their other friends. The learn that it's not a good idea to take shortcuts.
Based on a novel by Adam Nevill