Curse of the Crimson Throne
Korvosa is predominantly a human city, although all of the PC races in the Pathfinder Core Rulebook are welcome within its walls. Korvosa itself was founded many years ago by Cheliax, and most of its human citizens are of the Chelaxian ethnicity today as a result, although there are large numbers of Varisians, Taldans, and Vudrani present within the city walls as well.
Shoanti are also quite common, although they tend to be less welcome in certain parts of the city and face the specter of racism that lingers still in Korvosa, thanks in part to the city's unfortunate history of Chelaxian conquerors claiming the land from the Shoanti and forcing them to flee to the northeast to the harsh Cinderlands. While a Shoanti character may be subjected to bigotry from some of Korvosa's more narrow-minded citizens, having a Shoanti PC may open up other advantages later in the campaign. Other ethnicities are rare but not unknown in the city.
Dwarves mostly hail from nearby Janderhoff, many of whom have ties to robust trade and mercantilism between Korvosa and the nearby Sky Citadel.
Elves and Gnomes
Elves and gnomes are relatively rare in Korvosa, but not so much that they'd turn heads when spotted walking down the city streets.
Halflings are relatively common in the city; many have escaped from lives as slaves in Cheliax to the south, and many of Korvosa's shipping concerns have large numbers of halfling sailors on their payroll.
Half-elves and Half-Orcs
Half-elves and half-orcs are present in the city as well, but while half-elves can generally pass uncommented upon, many of Korvosa's inhabitants (particularly the Shoanti, who have a long, bitter history with orcs) react poorly to half-orc presences; bigotry and fear are unfortunately not uncommon against these oft-misunderstood folk.