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1.
A manga artist/writer/creator.
Rumiko Takahashi, the creator of Inuyasha and Ranma 1/2, is one of the most popular mangaka in Japan today.
by Stephanie M. October 25, 2003
 
2.
one who creates manga
the guy who wrote Yu Yu Hakusho manga would be a mnga-ka
by JadeJaganshi April 04, 2005
 
3.
some one who writes mangas (japanese graphic novels/comic books)
at fanime, i met some mangakas, for death note and vampire knight. they taught me new drawing styles!
by teru for the win January 31, 2010