

The Uchiha Clan had the Sharingan which has a lot of different stages:

  * Sharingan (Increases power with age/3 commas = maturity)
  * Mangekyo Sharingan (Unlock = Kill a close friend/family member) (Blindness over time)
  * Time Erase (Kasashi's Mangekyo Sharingan)
  * Eternal Mangekyo Sharingan (Perfect vision/Incredible Power)
  * Amaterasu (Invincible Fire Attack)
  * Tsukuyomi (Illusion Technique)
  * Mind Control (Shisui Uchiha 'Mental Genjustu')
  * Copying Ability (Endless library of techniques) (See opponents techniques/Mimic opponent)
  * Susano'o (Giant Skeleton/Invincible Sword 'Totsuka Blade'/Invincible Shield 'Yata Mirror')
  * The Blade and Mirror were found by Itachi, by unknown means - Teleportation
  * Intangibility (Madara Uchiha)
  * Izanagi (Dream/Illusion Technique)
  * Sharingan+Rinnegan Techniques
  * Mangekyo/Eternal Mangekyo 

And it varies for each user in shape and appearances:

  * Sasuke Uchiha - Six-Sided Star Shape (Mangekyo) Six-Sided Cyclone (Eternal)
  * Itachi Uchiha - Three-Sided Cyclone
  * Kakashi Hatake - Bizarre Three-Sided and Curved Cyclone
  * Madara Uchiha - Izuna Uchiha - Stange Opened Circle with Three Squarish-Openings
  * Shisui Uchiha - Four Sided Throwing Star

But the Byakugan stays the same and every member has the same one.

So it makes me curious, why doesn't Byakugan have a second stage?


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naruto
Why doesn't the Byakugan have a second stage?


There is a "second stage" of the Byakugan, called
[**Tenseigan**](http://naruto.wikia.com/wiki/Tenseigan). And it has its own
Chakra Mode, which is said to be on par with the Naruto's Nine-Tails Chakra
Mode.

When the Byakugan is combined with the chakra of an Ōtsutsuki clan member, it
evolves into the Tenseigan. The only known wielders are:

  * Hamura Ōtsutsuki
  * Toneri Ōtsutsuki

![enter image description here](https://i.stack.imgur.com/RcOuK.png)

The Tenseigan has abilities similar to the Rinnegan.

> The Tenseigan allows the user to control both attractive and repulsive
> forces, similar to the Rinnegan. Additionally, it also grants the wielder
> Tenseigan Chakra Mode, which in turn gives the user an increase in speed,
> power, strength, durability, and reflexes. It also grants its user Truth-
> Seeking Balls, thus granting the user all five nature transformations and
> Yin–Yang Release.
>
> source: [Naruto Wikia](http://naruto.wikia.com/wiki/Tenseigan)


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In the anime, before the events of Naruto the last movie, the byakugan were
the origional eyes of the otsutski clan: the precursors to all supernatural
powers in the narutoverse. Kaguya was able to obtain the rnnesharingan, which
simultaneously gave her both the rinnegan and sharingan, as a third eye while
her natural white eyes mutated into the byakugan. The byakugan, at least by my
standards before the conception of the tenseigan, were evolved from the
otsutski clans natural white eyes while the sharingan and rinnegan were
mutations caused by consuming the chakra fruit which most likely gave the
wilder greater power than they already possessed. This probrobly evolved their
natural physicality, eyes, but also gave them greater ocular power only
obtainable by eating the shinju fruit: sharingan and rennegan. also, the
tenseigan was most likely added post the events of the main story line to
elevate the powers of Hamura to be on par with his brother so they would be
deamed with the same amount of power.


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