this is my favourite seinen:
http://www.mangago.zone/read-manga/ouroboros/
I know the art may not be that nice (or, at least, it wasn't for me) but the story is definately work sticking around for
http://www.mangago.zone/read-manga/oshi_no_ko/
you know how I said the one above is my favourite seinen? this may well turn out to dethrone that, recently picked this up and IT IS SO GOOD! starts off lighthearted but is quite dark at times, showbiz related
http://www.mangago.zone/read-manga/homunculus/
quite psychological, you're in for a ride let me tell you
http://www.mangago.zone/read-manga/btooom/?iV77
survival manga, very interesting and action filled - binge worthy
http://www.mangago.zone/read-manga/school_of_horns/
quite wholesome and simple, light hearted read, worthwhile
http://www.mangago.zone/read-manga/stigmata_seikon_sousa/
its has really cool visuals, the sequel is more BL than this
http://www.mangago.zone/read-manga/until_death_do_us_part/
I haven't read much, but its pretty cool so far, unique concept
http://www.mangago.zone/read-manga/koko_wa_ima_kara_rinri_desu/
manga that makes you think about ethics, pretty good
http://www.mangago.zone/read-manga/funouhan/
dark, hella dark yet addictive
http://www.mangago.zone/read-manga/kami_sama_ki_sama_o_koroshitai/
I think its discontinued, but very worth the read, lots of killing and gore
http://www.mangago.zone/read-manga/pumpkin_night/
gory and twisted revenge by a pumpkin :)
This one is my favorite: http://www.mangago.zone/read-manga/yuukoku_no_moriarty/
It's very interesting. The protagonist is a villain of the story "Sherlock Holmes". This is a mystery btw. The protagonist is also very smart.
Without tokyo ghoul, oyasumi punpun and berserk (〜 ̄△ ̄)〜