Souji Hiura

Hiura appears to be emotionless and at one points tells Yoshimori that he thinks of nothing when using his powers. Hiura is hostile toward Yoshimori during their first encounter; however, he later reappears stating he has been ordered to help the Kekkaishi, but turns out to be little more than a puppet who obeys his current master for the time being.

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It is later revealed that he had been named by Suigetsu and was previously referred to only as Sango (Number Three). He was raised to be a puppet for Oumi.

(Source: Wikipedia)