Gaijin Mangaka? Possible but highly unlikely. There are tons of "capable nobodies" in Japan alone, how can somebody who lives in a foreign land make it through? Merely and immediately doing the "write-a-comic-and-look-for-publishers" thingie doesn't guarantee you much of a chance. Just like what Len said, it takes years to be familiarized with the Japanese whatnots and all the other aesthetic stuff about anime and manga. That being said, a way to heighten your chances in to attend and study in Japanese art schools especially those which focuses on the manga/anime field. But then again, tons of people are doing this but lady luck hasn't smiled upon them yet.
There are a couple of companies that produce non-Japanese manga, for some fans these companies are merely wannabes but for aspiring non-Japanese artists these companies could be their stairway to success.
If you want to work in the anime/manga field in Japan that badly, one of the best and possible things to do is work on outsourcing companies. Anime is bigger than manga in a global scale, because of this the companies' need for a much bigger workforce is growing. Anime companies have begun outsourcing for foreign talents, even a big shot like Toei has started to do this. By working as a foreign talent you have a slightly better chance to get noticed.
Japan has also begun to credit foreign mangakas, awarding them and giving them opportunities to take a step closer to their dreams so don't kill yours just yet. But don't expect too much about it, it's rather unhealthy to do so. It all boils down to how capable you are and how lucky you are.
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