The shiver (Shiver is a term for a of sharks)-
Killer: Bullshark
Dust: Oceanic Whitetip
Cross: Thresher
Horror: Great White
The levias-
Nightmare: Octopus in small form, and Kraken in big form
Dream: Goldfish in small form, and Koi in big form
Ink: Squid (He can shrink and grow in size, shifting through every squid cephalopod)
Error: A Moray Eel in small form, and a giant eel known as Abaia in his big form
Reaper: Orca in small form, and a ghost leviathan in his big form
The selkies:
Geno: Leopard seal
Blue: Harbor seal