Not necessarily seinen, any genre is fine, but not yaoi or anything like that please. As for tastes, I liked Darker than Black, Black Lagoon, and nichijou, but not Cowboy Beebop, sekirei, or Guilty crown. Also, please nothing based on a super popular manga. Thanks!
Heck, recommend some manga while you're at it.
Heck, recommend some manga while you're at it.