I will post more suggestions here when I get an idea, and no im not spouting out random animal names
Prehistoric Creatures:
Abyssal Mammoth with large tusks
Abyssal Dunkleosteus with a large mouth and plate like teeth (My Hang Down)
Abyssal Sabertooth with large teeth
Abyssal Coelacanth
Abyssal Trilobite. It could be a peaceful creature just like the mudskipper.
Mammals:
Abyssal Cat that could hunt small creatures
Abyssal Rat/Mouse (Not my original idea)
Abyssal Elephant
Abyssal Bear
Abyssal Bison
Abyssal Deer that could have antlers that can be taken off
Fish:
Abyssal Salmon, food for abyssal bear
Abyssal Goldfish, Small fish that just swims around
Abyssal Eel, An eel thats main food source is fish (Electric eel or not)
Abyssal Basking Shark, A giant shark that eats small fish
Abyssal Swordfish, Possibly could pierce skin
Abyssal Trout
Abyssal Sardine, very small fish
Abyssal Tuna
Abyssal Whale Shark (Not my original Idea)
Bugs:
Abyssal Mosquito (Not my original idea, I think)
Abyssal stick bug the length of a human
Abyssal ladybug
Abyssal Spider
Abyssal beetle
Abyssal Termite/ant, could have a life cycle like the bloog
Abyssal Moth that is the size of a human
Abyssal Wasp or Bee that infects things when it stings
Abyssal Spider (Not my original idea)
Abyssal Antlion
Reptiles:
Abyssal Snapping Turtle That has a strong outer shell
Abyssal Lizard
Abyssal Snake (catmanloke)
"Microscopic" animals:
Abyssal Tardigrade that is half the size of a human
Abyssal Amoeba that could infect humans.
Others
Abyssal Jellyfish that flys in the air and is about the size of 2 humans
Abyssal Fungi that infects things when it is touched
Mythical Creatures:
Abyssal Ent, A huge sentient tree creature that lives in forests.
Abyssal Basilisk, A huge snake like creature (Possibly a leviathan) that could swallow humans
Abyssal Hydra (My Hang Down) It could have 3 heads that could bite humans or swallow them. It could also be very strong just like how they are in fairy tales.
Items:
Abyssal Deer Antler
Abyssal Bison Wool
Sushi from abyssal fish (Likely poisonous though :P)
Abyssal Elephant/Mammoth tusk