 If you liked
Sayonara Zetsubou Sensei
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 ...then you might like
Kuroshitsuji
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Bit of a long shot but Sebastian is the only anime character I can think of that can be compared to Kafuka. Nice and likeable while hiding very dark, twisted and demonic presence. Often they both pop up out of nowhere and turn situations upside down with little effort.
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Recommended by blackhaulmike