Looking for stories where good characters turn bad/evil, especially manga which are interesting and have strong characterisation, good plot, etc.
*Turning bad/evil as in: joining up with the other side, committing various crimes, etc.

Not looking for manga which contains tragedy unless the author's really good at utilising it as a plot device instead of as a shortcut of ending the manga. No pure romance either 'cos I can rarely put up with nothing but romance(As in without drama, comedy, etc).

Can be shounen, seinen, shoujo, josei, etc. I don't really care for the genre: just that the story has to be good.

The most fitting that i have read is Berserk , but i guess Bleach could fitt in there too

Black Lagoon - Everyday salary-man and a few others get kidnapped while on business by South-East Asian pirates (the modern type), he gets Stockholm Syndrome and ends up joining said pirates mostly as a translator.

Airgear
Bleach
Vandread
Basara

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What a tangled web we weave, when we practice to deceive
:=EXITUS ACTA PROBAT=:

Not exactly good character turning bad but actually in Battle Royale..there is also one character like that in Kekkaishi but he is a side character in a recent arc...

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I seem to remember something like that in Watashi no Messiah-sama.

What? Bleach is not like that. The characters who turn traitor were evil from the beginning, just pretending to be fellow sheep among the herd but really wolves in disguise.

of course Naruto... suprised no one mentioned it

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Whats a Flapple?

Its too common one would have thought he'd already read it.
On that note: claymore

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What a tangled web we weave, when we practice to deceive
:=EXITUS ACTA PROBAT=:

hmmm try Rebirth ><

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Right, thanks for all the recommendations.

Uhh, the only one i can think of is Death Note.

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♪MONSTARR~ will eat all your cookies and steal your bishies~♪ Φ_Φ