Black Phillip

First appearance: The Witch (2016)

In the 17th Century a puritan family gets kicked out of the village they were living in and set up a farm at the edge of a creepy forest. As soon as they're settled in their youngest goes missing. Is it the work of a wolf? Maybe it's just God punishing them for being too prideful? Is it possible there's a witch living in the woods?

Nice creepy atmosphere. One of the best witch movies I've seen in a while.

Sweet Tooth

First appearance: Tales of Halloween (2015)

Ten Terrifying stories of the most awesome of holidays! All set in one town, each of the stories is by a different creative team who amazingly create a very consistent atmosphere.

Sweet Tooth appears in the first story aptly titled "Sweet Tooth," a tale explaining why you should never eat ALL your candy as soon as you get home from Trick or Treating!

The Lost Skeleton

First appearance: The Lost Skeleton of Cadavera (2001)

This appearance: The Lost Skeleton Returns Again (2009)

The further adventures of Scientist Dr. Paul Armstrong!

Living in the Jungle after his latest discovery was stolen by a rival scientist Dr. Armstrong is unaware that the nefarious Lost Skeleton is up to his old tricks. 

Molasar

First appearance: The Keep (1983)

Nazi's guarding an ancient keep awaken something horrible when trying to steal silver crosses embedded in the walls.  A mystical weirdo swings by to help a jewish academic and his daughter who are being held prisoner by the Nazis and forced to study the creepy keep. The weirdo's actually there to help the horrible thing. Weirdo falls in love with the academic monster. Horrible thing kills a bunch of Nazis proving that even ancient evil hates Nazis
Based on a pretty good novel by F. Paul Wilson.