SPOILER ALERT
Depends on what you are asking.
His partner in the Akatsuki is Kisame Hoshigaki. I assume that is what you mean.
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The (acting) Leader: Pain His partner: Konan Kakuzu His partner: Hidan Itachi His partner: Kisame Sasori His partner: Deidara The spy: Zetsu The (real) Akatsuki leader: Tobi (a.k.a. Madara Uchiha)
To show that they have foresaken their villages for the akatsuki.
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he join's akatsuki after he leaves the village he contacts uchiha madara and he helps him to get into akatsuki
He loves him as a friend. Though some think Tobi does not love Deidara because he is Madara Uchila, he loves Deidara as a friend, partner, and fellow Akatsuki member.