Board Thread:Improvements and Issues/@comment-1409915-20140307195609/@comment-26467723-20150605144805

yachiru is also named after Unohana, the only person Kenpachi ever respected.

It was years after his fight with Unohana that Yachiru "Appeared" out of no where. At that time, Kenpachi had already achieved Captain status, and as noted throughout the entire series, no child should ever be able to breath or live, while that close to someone with such high spiritual pressure.

He was then quoted saying "So you have no one either huh?" And GAVE her the name Yachiru. Many other times, he also said that his Sword has "No name."

Anytime Kenpachi isn't around, Yachiru is always quoted saying "I have nothing to do, because Kenny isn't around." That could be taken literally, or jokingly, but in all likeliness, she meant it literally, she had nothing to do, or rather, she couldn't do anything, because Kenpachi wasn't around.

Whenever Yachiru isn't around, Kenpachi is also seen as being a lot weaker, than when Yachiru is near him.

As a baby, Yachiru also touches Kenpachi's sword, which should have cut her hand at the very least, but she is perfectly unharmed, it is at that moment, Kenpachi "Adopts" her, as his daughter.

It is highly likely, that Yachiru has always been Kenpachi's Zanpakutō.

Kenpachi notes that even using all of his spiritual power, he could never seal his sword, which would make sense to mean that Yachiru is his Zanpakutō, since her Spiritual power is actually on Par with that of Byakuya Kuchiki, since she is seen dodging him, out running him, and being able to move about, undetected by him.

She is also seen fighting the same grade of opponents as other Captains.

There are also other Captains with releases that features Humanoid and creatures, without changing the base design of the sword, such as Sajin Komamura, and Mayuri Kurotsuchi, though Mayuri's sword goes back to his basic sword only in his Bankai, his Shikai does change forms.

Even during the anime filler where the Zanpakutō take their humanoid forms, Two people stand out because their Zanpakutō do NOT do this. Kenpachi and Yachiru, people shrug off Kenpachi because he was never able to use Bankai, but no one mentions Yachiru at all during this, which could just be a fluke, or on purpose, even though it was filler, it could give some nudges towards that Yachiru was Kenpachi's Zanpakutō.

Kenpachi has also always been able to sense Yachiru's spiritual energy, no matter how far apart they were, but when she vanishes, he is unable to detech her anywhere, it is at that moment, that truly shocks the fans that pay attention to this. She is completely gone, nothing is left of her.