Freddy Krueger-
Chihuahua (He's as feisty as one)

Jason Voorhees-
Bear (stature like one, and would definitely give the BEST bear hugs imo)

Michael Myers-
Cat (quiet, stealthy, will scratch you if you try to pet them in their least favorite spot, and will be annoyed by you [unless food is involved,then he'll tolerate you for a bit. His favorite being candy corn])

Ghostface-
Fox (sly,sneaky, and quick on his feet)

Bubba/Leatherface-
Tibetan mastiff (dog) (loyal, loves his family, they're pretty big dogs tbh, sweet, tough, and pretty chill [idk about the breed,I'm just going by a picture of the dog breed,and by his (Bubba's) personality])

Pennywise (1990)-
Alligator (water dwelling, stealthy, probably scaly)
Pennywise (2017)-
Crocodile (same thing as 1990 Pennywise)

A/N: This is based on their personality, and the way I imagine them as said animals.