Looking for a manga with a protagonist that is unforgiving and delivers unmerciful justice. You all know the guy that did something absolutely terrible and yet the hero forgives them and gives them a second chance (half the time comes back to bite them in the ass *ahem* Wolf Guy - Ookami no Monshou). I want the protagonist to actually deliver the final blow and just finish off the bad guy (even though you may know the circumstances behind their evil, which humanizes them in a way).

Also anything vigilante justice related is welcome.

Please warn me if it has immense rage moments so I can prepare mentally for the things to come. I'm traumatized from Wolf Guy, if you hadn't noticed already.

Requirements: Male protagonist

No thanks to: Yuri, Yaoi, Shounen-ai, Shoujo-ai, Gender Bender, Smut

Maybe Dendrobates may have, what you've been looking for? ^^

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"It's like love is a bonus in your life. Even without it, I'm just fine. I don't feel like pointlessly searching for it. You don't have to make yourself unhappy." (Ookami Shoujo to Kuro Ouji)

"Why does it rain?" - "To create drama." (Drops (Andou Yuki))

Akumetsu
Duds Hunt
Kimi no Knife
Black Lagoon
Red Eyes
Majin Tantei Nougami Neuro

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I agree with all those suggestions. Another one is Drifters. I just finished reading the scanlated chapters and it's a lot of fun. Think famous historical figures and random guys from different wars thrown into a fantasy world, unifying to battle against bad guys. You'll see things from 1st to 21st Century in it (+ some magical elements)