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Because of the following reasons:1)he wanted to kill people

2)he could easily kill people but if his neck or any other body part ever got "dislocated", he would need someone to fix it.He needed a partner but he was alone, so he joined the akatsuki as it was an easy way to overcome his weakness

3)he was immortal and bored, and joining the deadliest and most feared ninja criminal group seemed really interesting and a good time pass

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12y ago

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