Lovely, I'm happy to share one that I really think is awesome.
They are revenants in Scandinavian mythology, a spirit with a tangible body, usually as fallen warriors. They had characteristics of violence, bloodlust, greed, especially from mentions of them seen guarding hidden treasures.
They possess superhuman strength, known to be immune to most damage, and are said to be extremely terrifying to look at, or absolutely hideous. There are records of them having the ability to shapeshift. Examples from texts included seals, horses, bulls and cats. I found that exceptionally interesting.
They had a strong association with nightmares, due to their ability to enter dreams, and even curse individuals. One of the few known ways of stopping one is to decapitate them.
Some sources that mention these creatures can be found in various sagas, like Grettis, Lexleanda, and Harðar .
The Akhlut is my favorite, that's why it's also my fursona - with some modifications.
It's from Inuit mythology, a beast that is said to be able to change from wolf to orca, or sometimes be something in between. According to the mythology, they are a dangerous creature and a bad omen to see.
(art not mine)
Splintercat - a Bobcat that FUCKING HATES TREES. From the folklore of Native Americans of Northern Oregon
Stymphalian Birds - They're metal and they're angry. Hercules fought them. From ancient Greek mythology
Mishipeshu - a freshwater lynx demon with the power of weather control. From Anishinaabeg mythology. Art by Open Graves and Minds on Twitter
Krokotta - a hooved scavenger able to mimic human speech, and switch between male and female at will. Now thought to have been an exaggerated account of a Spotted Hyena, as recorded by Ancient Greek texts
Lou Carcolh - a dragon-snail from Basque folklore. Art by Behane's Cave on Tumblr
Teju Jagua - a dog-hydra demigod that guards a cave of treasures. From Guarani mythology. Art by Libro Prodigiosum on Tumblr
Ahuizotl - A water demon that drowns heretics in the name of the god of Rain, Tlaloc. From Mexica folklore. Art by Beastarium on Tumblr
My favourite is obviously dragons. Reptilians that have the potential to fly. Plus coldblooded in nature and considered to be intelligent.
Different types to live in different surroundings.
If the gravity of the planet was 1/8 of the amount of earth. There would probably have been more likely dragons existing and more flying reptilians with stronger bone structures.
Kelpies are very interesting though. Imagine a horse that gets people to ride it and tricking them to drag them into the abyss. Pretty much most aquatic creatures from mythology tend to have drowning as the traits they have.
I love chimeras - anything that is multiple creatures combined!
I also love half human creatures - from centaurs to mermaids!
I have one developed world centered around different types of half-human creatures and also really, really want some kind of deer based sona character. I have a couple of homemade chimeras that I've dreamt up myself but nothing I would use as a fursona, I just can't seem to get that kinda attachment.