Generic Fantasy Asia:

Races:
Human
Tiefling
Genasi (ninja clans with elemental bloodline powers)
Changeling (kitsune)
Aarockra (tengu)
Tortle (kappa)
Shifter (kemonomimi)
Tabaxi (Sun Wukong's monkey people)
Forest Gnomes (korobokkuro)

Religions/Social Groups:
Samurai: Any class with Noble background (Nobunaga was an Artificer, many ninja were members of samurai social class).

Fighter, particularly Battlemaster, Samurai, Banneret, or Cavalier. Paladin, particularly Oath of the Crown or

Conquest. Barbarian, particularly Path of the Ancestral Guardian, Totem Warrior, or Berserker.
Ninja: Any Monk. Wizard, especially focused on Enchantment, Illusion, or Evocation. Rogues, especially Assassins or

Arcane Tricksters.
Xia: Fighters, especially Battlemasters or Eldritch Knights. Paladins, especially Oath of Devotion. Wizards, especially

Bladesingers or War Magic. Monks, especially Way of the Sun Soul or Kensai. Mystic, especially Order of the Avatar,

Immortal, Nomad, or Soul Knife. Hexblade Warlocks.
Mongols: Fighters, especially Cavalier or Sharpshooter. Rangers, especially Beastmaster Rangers with Horse companions.

Barbarians.
Ainu: Rangers, Druids, and Barbarians. General nature/shamanism theme.
Generic Fantasy Europeans: Any, but with Far Wanderer background.
Taoists: Wizards, especially focused on Transmutation or Theurgy. Mystics, especially Order of the Awakened or Wu Jen.

Priests of traditional Chinese gods might be Clerics. Artificers.
Buddhist Priests: Monk, especially Way of Tranquility, Open Hand, or Sun Soul.
Shinto Priests: Clerics, for those that worship the more powerful/universal kami. Druid, for those that worship

features of nature like rocks or trees.
Onmyouji: Wizards, especially Conjurers, Diviners or Abjurers. Warlock, Shadow Sorceror, or Theurgist Wizard with the

Ambition or Death Domain for those that worship Amatsu-Mikaboshi.

Major Kami:
Izanagi: Life, Protection
Izanami: Death
Amaterasu: Light, Zeal
Susanoo: Tempest, Strength
Tsukuyomi: Light
Inari: Life, Forge
Hachiman: War
Amatsu-Mikaboshi: Ambition, Arcana, Death