Is it possible to be able to 公開する a マンガ in 日本 even though you're not Japanese?just asking^^

Yes it is possible, if あなた know enough of the japanese alphabet and language and style または culture, あなた can. (^_^)

yes as long as あなた can draw マンガ and write a story-line あなた can 公開する one^^eg sweat drop studios is a english based マンガ company^^

Yes, alot of マンガ isn't Japanese, I read some that Korean, Taiwanese, and America. Courtney Love, and Avril Lavigne, both put out manga, I never read them, but they are out there.

Yep

Stan Lee (with the help of the writer of Shamen King) got Ultimo published