I can't seem to find any good comic book publishers that don't focus on manga or superheroes. I want to publish a very alternative comic book.

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DC Batman comes from there xD

DC comics might be a good choice, I guess.-EG

Dark Horse Comics(is a lot more alternative than DC) and Evil Ink Comics ( AMory Wars (coheeds comic))

Image comics has already become as good if not better than marvel and all works published trough there are creator owned dark horse but they publish a lot less dont count big companies out dc owns vertigo and wildstorm which produce indie comics marvel has icon which also publishes alternatives all of which are creator owned

uhh wow there are a lot of good publishers, DC is obvious, theres darkhorse who made hellboy and Grendel series, theres image comics, and there is also top cow, they made the witchblade, and the darkness series.