Mermaids/Sirens

Nightcrawlers

Beastly women with Siren-like capabilities and a cannibalistic nature.

Colossus Jelly

Large enough to prey on humans and humanoid sea creatures.

Seaman

Part man, part seahorse

Sharkmaid

Part woman, part shark; teeth and appetite like a shark, intelligence and communications like dolphin

Inklings

Part woman, part octopus

Sharkman

Part man, part shark; teeth and appetite like a shark, intelligence and communications like dolphin