Are there any Аниме или Манга writers that isn't Japanese?

There are plenty of like Korean Манга authors....
They call it manhwa I guess but pretty much the same thing lol.

I do not think it would be "Anime" then.
There are collaborations, sure, both in Japan, and with Americans and it is basically the difference in East & West.

Let's say Ты are American and wish to write that style and form... Ты would either go to Япония или produce your own versions here but they would have to stand on their own, with their own titles under American categories and book names, etc. Nothing prevents someone from incorporating, but if it is American, it would not be an Anime. Манга is written different than American comics, so I would guess Ты would have to read legalites of publishing if Ты Опубликовать it yourself или ask your publishing house as far as Manga.

Afro Samurai had Japanese collaborators but is American made ( hope i'm understanding the Вопрос right)

Actually there are several Japanese Аниме that have had foreign backers to either continue the series или make Фильмы of.
Trigun, Tiger & Bunny and Panty чулок with Garterbelt as well as the Redline movie were specifically targeted with the western audience in mind.
Which is the only reason Trigun & Tiger & Bunny and the re-vamp of Hellsing (Ultimate) got made.

Arfo Samurai