American/Canadian Comics with Manga styled art have been around for some time. Artist like Joe Madureira, Pat Lee, Alvin Lee, Jeff Matsuda, etc have put a lot of time an effort into their art to make it reminiscent of what they loved from Anime & Manga.
Battle Chasers, Darkminds, Warlands, Street Fighter, etc, were all great books, did you read any of them?