Mythical and fictional and any other kind of water-based creatures are allowed, not just real ones.
I know I've drawn myself as a nautilus merperson before and I still really like that idea
I'd say it's a tossup between that and a giant isopod though
I drew myself as a dogfish mermaid before, and Virgil I divide depending on what I want. In canon he's a sturgeon, but I also like cowfish for cute small AUs and a three-bearded rockling
also GIANT ISOPODS ARE GREAT
Pythonmelon: THEY ARE SO GREAT AND ONE OF THE REASONS I'M SO STOKED FOR THE NEW POKEMON GAMES
YEAH GOOD I want to see one in person someday
/Sits in here for dis awesome question
I decided this for Daniel once, for a thread that never happened so far. It was a swordfish, with the ability to unsheathe spikes from his arms
I think I have a picture, hold on
I could also go for Marvelous being a Zora now that I think about it

Found it
/plays a mermaid in Ryslig lol
I made Fiora's fish half more or less a plesiosaur because there are Actual Dinosaurs in Xenoblade so it felt appropriate

There we gooo I found my mermaid self portrait
this is such a cool question

and a detailed look at Virgil
I want to be a jellyfish based mermaid
I second this is a really good question
googling jellyfish mermaid was the best decision I've made all night
Oh, wow, all of these are so good! ^_^ And all the pics posted are super neat, too!
I usually go with orca tail for regular Ralph, I've been wondering if a different kind of creature would be better for Space Marine Ralph.
As for me, I think I'd like orca, whale shark, or some kind of ray.
a really big turtle, maybe?
Ooh, that could be fun, all huge and armored and stuff. lol, he'd probably look like one of the TMNT, minus the teenage and ninja parts. XD
A really big leatherback ralph would be neat
Oh man, yeah, that turtle looks awesome, it fits him nicely!
I can't quite settle on a choice entirely, however, I believe I might take to life as a mer with tentacles (octopus, squid, cuttlefish?), moray eel, or a manta ray