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Dunno if it counts as deep sea, but coelacanths =)

giant isopods are pretty rad

Bone-eating tube-worms!

I like angler fish. Finding Memo had a huge effect on me, and I was well into my 20's when that came out lol.

Siphonophores. Extremely alien looking colonial organisms. Iirc they are, by far, the longest known aquatic creatures.

Whats the scientific term for that oceangate thing that sploaded with all the billionaires?

Idk if I have a fave deep sea creature, I’ll have to think about that.. but I’m rather fond of coconut crabs. They steal shit from people, and are enormous.

Bigfin squid

Most alien shit on our planet

The pacific tree octopus; of course.

https://zapatopi.net/treeoctopus/

Pigbutt worm

Deep sea Jeff. Much like regular Jeff but he’s waaaaay down there.

Whale Sharks. Just look at them. Not a thought behind those eyes. And they're polka dot patterned. Wobbegongs are pretty great too. They have the cool name, and much of the pluses of the Whale shark. They also have thoughtless eyes.

Shrimp and Lobster

It's not a super creative or interesting answer, but I'd be lying if I said anything other than the giant squid. That's gotta be one of the wildest most alien things on our planet. Squid are already fascinatingly weird and now you're telling me there are squids the size of a horse that fight whales at the bottom of the ocean? Amazing. Please stay down at the bottom of the sea where I am not. I know the colossal squid is bigger, but it's cool that the giant one is probably the basis of some of our most enduring myths of sea monsters and the name "giant squid" just rolls off the tongue really well

Cthulhu. Also the reason I refuse to go into the ocean. Hes in there somewhere and Im not chancing that encounter

Greenland Shark

Greenland sharks have the longest lifespan of any known vertebrate, estimated to be between 250 and 500 years. They are among the largest extant shark species, reaching a maximum confirmed length of 6.4 m (21 ft) long and weighing over 1,000 kg (2,200 lb). They reach sexual maturity at about 150 years of age, and their pups are born alive after an estimated gestation period of 8 to 18 years.

Absolutely everything about them is interesting. And as far as an entity, they are a fantastic role model. The world would be a much better place if we were all more like the Greenland Shark.

I don't have one, but now I'm thinking about it