The Books of the Raksura are a fantasy series by Martha Wells (website here). The first book, The Cloud Roads, introduces us to Moon. In the Three Worlds, there are perhaps hundreds of wildly diverse humanoid species — but Moon has spent most of his life thinking he's the only one of his kind. And unfortunately Moon, who is a shapeshifter, just happens to resemble (in one of his two forms) the most rapacious and vicious predators on the planet: the Fell. Moon just wants a place to belong, but he must constantly guard against others learning of his secret. When he finally meets a member of his own kind, a whole new set of adventures begin for him, and he faces his biggest challenge of all: fitting in.There are presently three books in the series:
The Cloud Roads
The Serpent Sea
The Siren Depths
The Books of the Raksura provide examples of:
Age Is Relative: Pearl may be a hundred years old or more, but she competes with her daughter Jade (who is probably Moon's age, in her thirties/forties) as if they're sisters. Inverted in Stone, who is Really 700 Years Old, or at least a few hundred, and acts more like a big brother to Moon.
Ancient Artifact: Essentially the whole of the Three Worlds, which is littered with the ruins of extinct empires and species.
Badass Grandpa with a general subset of Stronger with Age: Stone, and by extension any elderly Aeriat; they get stronger and bigger, not weaker, with age. Moon is initially stunned to realize he and Stone are the same species because Stone is three times bigger in his shifted form.
Bi the Way: The fact that Moon occasionally sleeps with Chime is in no way played for drama. It could be inferred that Everyone Is Bi, Raksura in general have a very casual attitude towards sex.
Body Horror: Moon reflects on this when he learns about Chime's abrupt change from mentor to Aeriat.
Floating Continent: The Three Worlds are strewn with floating islands. A specific type of magical rock is responsible for their flight; one race uses it to build flying boats. No, not Cool Airships, but flying boats.
Hive Caste System: The Raksuran social structure includes two breeds (winged Aeriat and wingless Arbora), and several castes within each breed, all ruled by a powerful queen. Moon is a consort, the only male who can breed with a queen to produce children, which makes for some interesting gender dynamics given that the queens are bigger, stronger, and decidedly aggressive.
Interspecies Romance: Moon's initial relationship with two groundling women; it's implied that he's had other relationships in the past. Also, a big secret of the Raksura is that they came from the same 'forefather' race as the Fell, -the Raksura became a distinct race after the 'Aeriat' interbred with the Arbora, who were once a separate species entirely.
Involuntary Shapeshifting: Raksura children can be forced to change shape just by startling them. Older Raksura can control it, but Moon fears sex with groundlings because in a moment of, er, distraction, he might give his lover a little surprise.
Jerkass: Pearl, who seems to delight in pissing off everyone around her.
Little Miss Badass: Potentially every female Raksura; they're cute when they're little, but adult females are bigger and stronger than males, and queens are basically born badasses.
Magic Pants: The ability to keep one's clothes when shifting is mentioned to be a "bit of magic" early on. It can also be used to hide weapons.
Magic Tool: Literal; mentors create light by infusing magic into inanimate objects, like rocks and shells. Other races in the Three Worlds use various created and found magical tools, such as creating flying ships from pieces of flying islands.
Masculine Girl, Feminine Boy: Gender roles among the Raksura seem to be more or less nonexistent... except among queens and consorts. Queens are stronger, aggressive, bossy, and possessive; consorts start out weaker (although they get Stronger with Age), and aside from Moon, are supposed to be shy and high-strung. Queens fight over them and — as Stone implies to Moon re: Pearl — may not take no for an answer, especially with younger consorts.
Menacing Stroll: Most Aeriat females, and Ranea, the half-Fell half-Raksuran queen.
Monster Progenitor: Literally in the case of both Fell progenitors and Raksuran queens. And especially Ranea, who's both, and who's been laying waste to the Three Worlds just to get her hands on Moon, whom she wants as a(n unwilling) mate. Fell progenitors are likely also Mothers of a Thousand Young, because they're the only female Fell and yet somehow give birth to giant kethel, rulers and other progenitors, and numerous swarms of dakti.
My Instincts Are Showing: Moon doesn't know much about proper Raksuran behavior, but fortunately much of it is rooted in predatory dominance behavior.
Our Dragons Are Different: The Raksuras' shifted forms, especially those of the Aeriat, are basically humanoid dragons: scales, wings, tails, claws, and they have a taste for shiny things. They're omnivores and not carnivores, and they don't breathe fire. No need, since as s/he gets older an Aeriat becomes a Giant Flyer.
Raised by Wolves: Inverted; Moon has trouble among the Raksura because he wasn't raised in their wolfpack/lion-pride-like society.
Secretly Dying: Flower sickens and dies of old age over the course of The Serpent Sea, pretending all the while that she'll be fine if she can just get some rest. The trope is subverted, as it was only kept secret from Moon. Everyone else had recognized the signs long beforehand.