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Doujinshi (同人誌 "fan magazines") are fan-created, non-canonical comics or novels. They are often the work of amateurs, though some professional artists participate as a way to publish material outside the regular industry.

The famous manga-ka Koshi Rikdo, creator of Excel Saga, used to draw Sonic the Hedgehog doujinshi. These comics usually consisted of people dressed like Sonic, Tails and Knuckles.

Doujinshi are made by artists or writers who prefer to publish their own materials. Avid fans of doujinshi attend regular doujinshi conventions, the largest of which is called Comiket (short for "Comic Market") held in the summer and winter in Tokyo's Big Sight. Here, over 20 acres of doujinshi are bought, sold, and traded by attendees. Doujinshi creators who based their materials on other creators' works normally publish in small numbers to maintain a low profile from litigation. This makes a talented creator's or circle's doujinshi a coveted commodity as only the fast or the lucky will be able to get them before they sell out.