Silas is a gorgon like medusa In Greek mythology, Medusa also called Gorgo, was one of the three monstrous Gorgons, generally described as winged human females with living venomous snakes in place of hair. Those who gazed into her eyes would turn to stone.

Acrachne is based off of Arachne in Greek mythology was a weaver who challenged Athena and was consequently transformed into a spider. There are three versions of the myth. One version has it that she was a shepherd's daughter that was particularly skilled at weaving.

Walker is a wendigo which is a mythological creature or evil spirit from the folklore of the First Nations Algonquin tribes based in the northern forests of Nova Scotia, the East Coast of Canada, and Great Lakes Region of Canada and the United States.

Moon is a werewolf In folklore, a werewolf is a human with the ability to shape shift into a wolf (or, especially in modern film, a therianthropic hybrid wolf like creature), either purposely or after being ... 

Calipso is a chimera, The Chimera, according to Greek mythology, was a monstrous fire-breathing hybrid creature of Lycia in Asia Minor, composed of the parts of more than one animal. It is usually depicted as a lion, with the head of a goat protruding from its back, and a tail that might end with a snake's head

and maddy is a manticore! A manticore is a mythological creature that was said to be unconquerable. The mighty beast is best known for its strange but magnificent features. It is often said that the beast had the head of a man, the body of a lion, and the tail of a scorpion.