Murders. And not open-and-shut ones, those are boring. What makes it interesting is if the murderer is competent enough that their guilt isn't immediately obvious.
I know a man whom might interest you then, he works with me as well. Though he's more of an assassin than he is a serial killer, still his murderers are far from open and shut. As for guilt, he has none. He does have one rather twisted relationship with another man whom is working against us though.
He's called the Sakurazukamori. Tends to actually work for the government of Japan, killing people off whom harm its stability.. or so goes the excuses for the assassinations anyway. It doesn't matter what sort of defenses you have or how much money you have, if he's marked you as his prey, he'll kill you. He's an onmyouji as well as an emotionless killer, which I believe works to help him in his business.
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I've never been one for environmentalism.
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You remind me of one of my comrades. He's working with me because he believes it'll be interesting.
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Serial killers as well.
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