[Zangetsu waits, patiently, while the gears turn in Xehanort's mind. While his hearts settle on what they want, as a unit. Zangetsu has no memories of his past, but he has intrinsic knowledge befitting a zanpakutou. He sees it. He feels it. The drive for power, that desire to protect oneself and loved ones, a strong need to rise above and conquer so that one never has to feel fear.

Zangetsu could give him all of that. And in return? Zangetsu could become more powerful himself.

He approaches Xehanort and offers a sweeping bow]

Say it, then. --Your real name, not the persona the Gods here gave ya. I am known as Zangetsu, the blade that slays the moon and slices the heavens. Give me another name and let me add my power to yours... partner.