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Refluffed D&D4

Do you mean Japan or like, genuinely oriental?
It actually doesn't.
Everyone in Faerun THINKS it's one country but it's actually quite a few.
The actual problem is that in most cases they just lift up actual periods of Far East history and drop them next to each other with relatively few changes rather then try to draw from different sources. Half of the time they even use historical names of the countries.
There's TWO separate Japan's for instance, one for the Sengoku Period and another for the Edo Period immediately afterwords.

Genuinely oriental. While I wouldn't mind running a Japanes campaign inspired by James Calvell's Shogun, if my group ran straight Japan there's no way it wouldn't immediately fall into pure weeaboo territory.

>Genuinely oriental.
L 5 R
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Then yeah, rules aside D&D's Kara-Tur setting is pretty multi-cultural Asian and actually even explores different time periods within the same country when it was different enough to matter.
Probably would work best with 2e or 5e though, 3e and 4e lack a lot of the flavor flexibility in favor of giving everything hard rules and selling more splat books.
Speaking as someone who's parents are not native English speakers and who has relatives STILL IN Japan, L5R is Japan, straight-up.
Japan filtered through an idealized and very Generation X-ish storytelling mindset (thanks for that Wick) and a failure to understand the cultural underpinnings and then most of the fantasy elements resembling more LotR rather then actual Japanese mythology, but there's barely anything of China or Korea or Vietnam or anything other then Japan in there.

Maybe I'm just biased because I've only ever read the 3e support for oriental adventures. I'll give the setting and the 2e support a glance over along with Qin and L5R.

The 3e stuff is L5R's Rokugan setting.

>Probably would work best with 2e or 5e though, 3e and 4e lack a lot of the flavor flexibility in favor of giving everything hard rules and selling more splat books.

4e is a very reflavorable thing. Heck the DMG does a lot talking about doing that for PCs and monsters alike.

L5R is only partially influenced by Japan. Rokugan itself is very clearly China, and their colony is obviously India. Some of the clans are more Japanese than others, and in some time periods the political system is more like China's than Japan's.

"Not including" Korea in a fantasy Asia is like "not including" Brandenburg in fantasy Europe. Its most distinct feature was its status as an actual kingdom, but it was still a vassal of China which parroted Chinese culture and religion.

Vietnam is not part of NE Asia, but I believe one of the minor clans who fight with Crabs are supposed to represent the jungle barbarians of SW China.

4e is easy to flavour because it's just rice. Most of the power descriptions are incerdibly vague about what your character is actually doing and what the effects look like. You're just throwing numbers st other numbers.