hi there im looking for a manga that resembles the show "Dexter" , the show is about a serial killer who kills only bad guys, here is the exact synopsis: [http://www.imdb.com/title/tt0785280/plotsummary]
it would be nice if it had a little bit of romance or comedy but yeah
thanks in advance 😀 😀 😀

Hey Ouroboros is quite similar 🙂 .

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Zetman

Nulla in mundo pax sincera
"Always go too far, because that's where you'll find the truth." - Albert Camus

aphorism i think fits your request somewhat...it's nice and bloody ^^
and the main guy hasn't really killed but he's got the qualities

Death Note has similarities to it, and also Akumetsu if you are into a more seinen type manga.