He bears the name you gave him against his will. Whether you're leaving him in his other form or not, Roxas, you're forcing him to remain your shinki, because he has no power to reject his name.

[Hakkai's gaze flicks unsympathetically to the blight on Roxas's arm, and back to the shadows of his hood.]

I don't know when or where he encountered you or your shinki. I wasn't aware they'd been attacked. Now that I know, I can respond, and I will.

Unless you'd prefer to allow him to blight himself, and you, to death, of course.

It appears from your condition that that is the other option.