Something like a cross between fan fiction and minicomics, doujinishi are most often defined as self-published parodies, extrapolations or fantasies revolving around popular, existing (and generally copyright-protected) characters and franchises. They’re generally created by fans for other fans, although the doujinishi culture is so pervasive in Japan that the phenomenon is tolerated and, in some cases, even encouraged and participated in by professional creators (and copyright holders).
Western otaku have likely seen more than their fair share of doujinshi, but more casual Western comics fans likely haven’t had any real exposure.
Enter Dark Horse’s recent Neon Genesis Evangelion: Comic Tribute, an officially sanctioned, professionally curated and created, $11, 170-page doujinishi-style anthology, produced and published in the digest-sized tankobon format made familiar to American manga fans over the past decade and a half or so.
But what is it, exactly? A bunch of different manga creators, the most prominent among them probably being Sgt. Frog‘s Mine Yoshizaki, providing short, parodic riffs on various aspects of the Evangelion franchise. Think of it as the manga equivalent of a celebrity roast.