.

Furthermore, what is the final getsuga Tenshou?

?, Moon Fang) itself. It is referred to as the "Final" Getsuga Tenshō due to the fact that, once used, Ichigo loses all of his Shinigami powers. For the duration of the ability, Ichigo's hair color turns black and rapidly grows to waist-length.

Also Know, is Yhwach a zangetsu? After being told by Ōetsu Nimaiya Zangetsu is not his real Zanpakutō and has the appearance of Yhwach from 1000 years ago, Ichigo enters his inner world to confront him. When Ichigo tells him to explain himself, Zangetsu, stating what Ichigo was told is true, reveals his name is not Zangetsu.

Beside above, what is Mugetsu?

To put it bluntly, Mugetsu is a Plot Facilitator and Bullet that Kubo used to dig himself out of the mess he made during the Karakura Town arc. He needed a quick way to get from point A-B while still trying to contain the unbelievable levels of power Aizen had reached, and thus Mugetsu was born.

Why did Ichigo use Final getsuga Tenshou?

So Ichigo using the final getsuga tenshou and losing his powers was so that the story could continue without him being the strongest person in the show. And it allows him to gain a different power(Fullbring).