For Nihlus and the Natavathi in general:
Wings?: Yes
Shoes?: Nope
Paw pads on their hands?: Yes
Claws?: Yes
Hair?: No
Fangs?: Yes
Gills?: Yes
Clothing?: Only when shifted into a humanoid or human form
More human-like?: See above
More animal-like?: Naturally quadrupedal
Sexualized?: No
Full-blown backstory, traits ect.?: Yep!
Modern society?: Technically; see below
Pre-Civilization?: Technically; see below
Apocalyptic?: No. To further clarify: On their world it is a combination of magic and hard science. However, there are numerous planets and societies through the universe that Nihlus' visits; thus these worlds may well be modern, apocalyptic, futuristic, etc.!
Speaks human language?: Indeed, in either form
Barks, neighs, body language?: Hisses, whistles, chirps, song, body language, "gem" eye color change and bio-luminescent spots (primary form of communication between one another).
Feral form?: Primary
Can shift between feral/anthro form?: Yes
Fit in with humans?: Not necessarily. Very few can take on a full human appearance. The vast majority are only able to shift into a vaguely humanoid form while retaining their legs, arms from the forearm down, head detailing (horns, feathers), tail and wings. However, in the sense of meshing with society? They can freely communicate between them and interact, but they choose to live outside of their realm.
Matches your personality?: Yes
Matches your appearance?: Er. Only in the sense that we're both incredibly tall and transgender? Hard to match with a quadrupedal alien thing.
Matches your spirit animal?: ...No.
Political views?: Democratic Socialist/Oligarchy if a must; has no real political leanings and does his best not to associate with any specific views
Government?: "Anarchy"
Religion?: Less religion, more of a spirituality. The Natavathi believe they came from and perhaps even are the stars, landing on the planet they currently inhabit centuries back. When some of their people chose to remain behind and mingle, they would slowly begin to lose the magic that gave them the ability to survive in the voids of space, opening rifts that allowed them to quickly traverse between galaxies and planets. They think if they can gather enough magic, they will regain this 'lost' ability and once again live as celestials. All of their ideals and make-up revolves around this entire idea. Vague combination of monism and animism.