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I honestly think that Joker is the odd one out since he is the villain between the others. Batman and Sherlock Holmes(I think it is Holmes) try to bring peace where Joker is the one who causes a chaos for Batman to solve. Furthermore, detectives can also do crime but if we consider the conventions we have, Joker is the odd one out with his hideous past.

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It is the detective because he is the only one who follows the law/the government. While batman is a vigilante and follows his own laws, and clearly the Joker doesn't follow any laws...

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It is the detective because he is the only one who follows the law/the government. While batman is a vigilante and follows his own laws, and clearly the Joker doesn't follow any laws...

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I think its batman because he is the only one who is two people at a time so at one time he is a hero and another time he is a ordinary human.

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It is the detective because he is the only one who follows the law/the government. While Batman is a vigilante and follows his own laws, and clearly the Joker doesn't follow any laws...

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the joker is the odd one because he is the bad guy

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the joker because he kills people. so he is bad. Detectives and batman can be considered as good guys. The joker is bad.

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I think the joker is the odd one out because the detective and batman are trying to help the world but the joker is doing the opposite(villain).

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It is joker because batman and the detective are detectives, but joker isn't

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I would say that the odd one out is the joker because he is the one who causes havoc yet batman and the detective help end the problems.

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I think that the odd one out is the Joker because he isn't a detective unlike sherlock and batman because they both solve crimes.But the joker is the one that commits them.

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i would think its the joker even though batman and him come from the same dc universe while the detective is totally out of the blue, the joker is an antagonist and he is evil while a detective and batman saves people which makes them protagonists but if you look at the other side of it, batman and joker kills while a detective does not.

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I think that they joker is the odd one out because he is the only one who does bad things. Another reason might be that the detective and batman try and solve problems.

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I think it is the detective because he is anonymous and is not a hero or a villain that is familiar to us and (detectives are what we are learning about right now).

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I would say the joker because he is the person that creates the damage while Batman and Sherlock holmes find and capture the people that are doing bad things or crime