I'm looking for a manga where a character (especially female) turns side from "Light Side to the Dark Side" , " Good To Evil" , "White To Black" , etc.

Well, I'm not saying that the character "Must" turn into the enemy, sometimes maybe they turn into the "Dark Side" where the "Dark Side" is the main Character.

Examples :
Aashia Argento from High-School DxD
Etou Fujiko from Ichiban Ushiro no Daimaou

Well it might some weird but please high me okay
And forgive me if my descriptions aren't clear enough

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BUMP!!!

Help Me Please......

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It happens with The Legend of Sun Knight. It's a really funny and interesting series, I highly recommend it. But the releases are slow, so I recommend The Legend of Sun Knight (Novel), as it updates much faster and is even funnier.

Gong Hua (Novel) - not many chapters yet, but from the summary, it seems like this kind of route.

Hoshi no Samidare - as far as I've read.

Durarara!! (Novel) - the anime is also great. Not sure about the manga.
Yu Yu Hakusho - later on in the series.

Black Lagoon - pretty good.

School Days - yup.

Thanks !

Any more reccommendation ?

P.S.

It will be great if the manga's graphic is nice

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Shin Angyo Onshi
Sorta kinda has something like that?

It takes some time, but Tsubasa Reservoir Chronicles developed that idea in an interesting way.

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Ganbare Seishuu! Ganbare Seishuu!