I like the dwarf-like Korobokuru. They are very cool.
Ratkin/ratlings/nezumi is well, but I would like some "evil" nezumi (I´m sorry, the skavens from warhammer is a very strong influence).
Hengeyokai has a great potential. "soft/light and rogue version of werebeast"? But they can´t not be "hairy rogues"
Vanara needs a beter background. It can not be only "jokers". They can be wise people.
Spirit folk (why not a oriental name like shen?) are better with a background of noble fay (like eastern eladrins, or Crane clan from legend of five rigns).
Bakemono has to be a playable gobling race (but clever than 3rd versión).
Naga folk (with arms) can be playable race too.
The Vanara stem from old Chinese Kung Fu movies, like the one featured in the Forbidden Kingdom. Monkey People who like to play pranks on people in order to teach them something. Very becoming of monkey-people.
Think Rahfiki from the Lion King if you didn't see Forbidden Kingdom.
The Spirit Folk are not noble simply because they can't establish their own ties. They're spirits tied to their surroundings. What makes one Spirit Folk tied to a tree any better than another?
They aren't really a good roleplaying race.
As for the spirit folk, I never quite got what they were supposed to be. They seem a mix between humans and native outsiders/fey, but I can't quite get the flavor. It could be made into anything you want; perhaps they would be several fey courts that they belong to (depending on the terrain) or some such.
or
spiritfolk
skaven, rylkar
naga
ogre magi
rakshasa
vaati
vanara
kalashtar
Rylkar (from MM V) are rat monster, not rat humanoid race.
Now the ogre mage are named oni. A oni PC race or monster class? good idea!! ;)
Kalasthar are from Eberron, I´m afraid. but we will se in a PH anyway.
Vaati is final boos from videgame Legend of Zelda. It isn´t D&D copyrigth. I´m sorry!! (It isn´t truth I´m sorry)
rylkar, I changed them
vaati, nah I meant The Wind Dukes of Aaqa, they're in OA web enhancement
They are the clasic crow-men (like the crow werebeast), or the classic humanoid with long nose (symbol of proud or arrogance). I refer to second one, with long , but not so exaggerate, nose.
Humans: Primary inhabitants
Spirit Folk: Products of Human and Spirit unions. Are fairly rare, and are afforded great honor.
Halflings: Primarily live in one city, and can be found in small minorities in some others. They are very gypsy-like.
Thrii-Kreen: Live in secrecy in a great vault in the Underdark. The only practitioners of Psionics, and the only keepers of the "true" history of the continent; ie, the one not changed by Humans and their deities.
-Any suggestions for any other interesting races? I always felt maybe there could be one or two more, within reason.
You should throw in Duergar. They'd fill in the Dwarf niche, but would bring plenty of conflict and complications. I'd go for the more Neutral interpretation of them, to make them a better PC race. More self-serving and opportunistic than out-and-out evil.
They'd also give you another Psionic race to work with, and you could potentially work in a background story involving the Thrii-Keen. Maybe they stole the secrets long ago? Maybe they subscribe to the same view of history, with their own ethnocentric variations?
Also, PC Goblins are always great, especially if you take on the mad tinkerers variation found in things like WoW or Iron Kingdoms. They could also have an antagonistic or maybe working relationship with Halflings. Either one would require interesting explanations. Again, push them towards a neutral balance as a whole in order to have some equilibrium as a PC race.
-Dwarves, even as Duergar, I don't really see as "fitting". I was thinking about some kind of Dwarf "niche", but I don't really see it, in regards to my "Oriental section", to so speak.