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Ken Joshima is a loyal friend and follower of Mukuro. Born on July 28, he was also experimented on by the Estraneo Family, and decided to follow Mukuro when the boy killed their captors. The experimentation on him resulted in his ability to gain the attributes of certain animals, like wolves and lions, when he changes to different sets of teeth, increasing his agility, strength, and senses. He was Chikusa's cellmate in jail and often calls him "Kakipi".

Source from Wikipeida