BERSERK! BERSERK! BERSERK! BERSERK! BERSERK! BERSERK! BERSERK! Other than that I'll have to say Rurouni Kenshin and Samurai X, Naruto, Full Metal Alchemist and of course Samurai Deeper Kyo. Did I mention Berserk?
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One who fights with monsters should look to it that he himself does not become a monster... When you gaze long into the abyss, the abyss also gazes into you... -Friedrich Nietzche