((This fan-fic starts just after the Uchiha Clan Massacre.))
Disclaimer: I do not own Naruto (manga); Uchiha members Itachi, Shisui; Madara; Sasuke; Fugaku or Izuna; jutsu recognized in Naruto (manga) or any of it's characters. Things that I do own will be placed at the bottom of every update, though I do own Izuna's abilities for all intents and purposes, just not the name.
Chapter 1: Foreboding Winds
Uchiha Izuna. Renowned as the best shinobi the Uchiha clan ever produced. Known to be the equal to his brother Madara in every way. It's what they didn't know which made him truly dangerous...
Unknown Location; Hi no Kuni; 7 Y.K.A (Years after the Kyubi Attack upon Konohagakure)
The wind swept, gusts and pockets of air forming, collecting into small areas, before being swallowed by the stormy gale. A lone figure stood dead still in the centre of the unnatural weather, pitch-black cloak sweeping up, cold wind billowing through his hair and buffeting into his face. Black spiked locks of hair swept over his face before being pushed away again by the storm. Revealing only cold, crimson red eyes, with an atomic symbol, similar-looking to a pinwheel, as a pitch-black pupil. Uchiha Izuna.
The name was brought with a chill in the air, not entirely caused by the winter gale. It was the name of someone dreaded... someone unnerving to be around. In every tale of the Uchiha, it was said that though Madara, their champion, was cold-hearted and ice-chilled to the bone, with a frostbitten heart which had shattered after the uprising of his clan, their progenitor, Izuna, Madara's brother, was a proud, loving, caring man who gave his all to protect his sons, who would become the grand elders of the Uchiha clan in the time of the clan head Uchiha Fugaku. This was all a lie. It was thought that Madara had claimed the first Eternal Sharingan. Another lie.
The tales of the Mangekyou Sharingan, of the twin Uchiha brothers, were founded mainly on truth. However, there were details that were left out of the clan's history. Of the wielders of the Sharingan, not three, but five men have paved their way to greatness in the evolution of their famous eye technique. Uchiha Madara, Uchiha Izuna, Uchiha Itachi, and two unknown members, whose names are unremembered by history. Although Madara did indeed slay his closest friend to gain his Mangekyou Sharingan, Izuna did not. He did indeed slay his closest friend, but both of them awakened their evolved Sharingan in a sparring match, unknown to anyone but each other. They then fought with furious attacks, assaulting one another's defences in an attempt to take the other's eyes. This was what led to Izuna murdering his best friend - the quest for the Eternal Sharingan.
Though Izuna obtained his prize, he learnt that if he flaunted his power like Madara would have done, he would be banished or killed in order to protect the clan. Instead, he simply used his normal and Mangekyou Sharingan, fooling everyone into believing that he was simply equal to his brother. Of course, how do you explain his death and the obtaining of Madara's Eternal Sharingan if Izuna never died? Simple: though both siblings were equal in their use of their Sharingan, Madara went blind from overuse. Due to this, his body started to wither away, as was the defect of the Sharingan's power. Izuna seized the opportunity to force another member to gain the ultimate power, in an attempt to fool them into thinking they would be able to take over the clan as a co-head along with Izuna. However, utilising a powerful Genjutsu, Izuna then offered Madara "his" eyes in order to stop the death of his sibling; all this was an elaborate scheme to escape his pathetic clan. While the other user sacrificed their life in the name of Izuna, under a powerful Henge to conceal their features, Izuna was able to escape, while Madara held funeral for his "deceased brother".
Now out of the clutches of the Uchiha, Izuna was able to go where he wished, provided that he didn't instigate conflict whenever another Uchiha was about. This wasn't exactly difficult for the coldest member of the clan, for he was the most calculating as well. With his actions of selfishness, mis-interpreted due to his deception, Izuna drifted out of Uchiha history, and entered Uchiha legend. His skills thought to be lost, never to be taught to the next generation... how foolish a thought that went through the Uchiha clan elders. None the less, Izuna's name was only uttered upon the winds once he left…