Kareth Seto

Kareth Seto (瀬戸クレス,Seto Kuresu) 

Background
Kareth was born to the decently small yet powerful Setouchi clan, based in the tiny, unknown village of Hikarigakure. Kareth is the youngest child of three, and was always alienated by his peers and family. When he was six years old the Hikarikage, known for his sensory skills, detected a dark power within him. After several attempts on his life, Kareth's family was forced to move to Konohagakure.

While in Konoha, Kareth learned of the intense rivalry between the Uchiha Clan, whos ninjas tended to have a fire affinty, and his own Setouchi Clan, whos ninjas have a mainly water affinity.

Due to his parent's influence in Konoha, Kareth was only required to take a few classes in the Academy. However, while he was there he became good friends with Sasuke Uchiha. Kareth and Sasuke got along extremely well, and often sparred together. Another main reason for their friendship was a mutual dislike of Naruto Uzumaki. Kareth's friendship with Sasuke ended the night after the Uchiha Clan Massacre.

One night, after an intense fight with Itachi Uchiha, Kareth's brother Heiro went insane, as he had never defeated the Sharingan. Kareth watched his mother slain by both his brother and father, before his very eyes. Later that night as Kareth fled from Konoha, a dark figure with dark red sharingan eyes swooped down in front of him, Itachi had come to save him from his brother.

Kareth and Itachi travelled together while the latter worked for Akatsuki. Itachi attempted to train Kareth in several jutsu, all in vain. However, it was one night when Itachi was poisoned and became sick, his attacker revealed that one day, wether tommorow, the day after, or even a year later, Itachi will die. Upon seeing his   "Itachi-nii-chan" weakened, Kareth unleased his clan's Kekkei Genkai, The Morrigan Eyes. While fighting Itachi's assailant, Kareth used Morrigan to copy a Great Fireball Technique and throw it back at him, enhancing it further by combining it with a second, destroying the ninja-assasin.

Further adventures with Itachi show that the pair encounted Kakashi Hatake. Itachi told Kareth to stand back with Morrigan active, and watch the fight. Kareth was able to learn Lightning Cutter and Shadow Clone Technique, using them both to suprise and defeat Kakashi.

Around his sixteenth birthday, Itachi told Kareth he had to leave, to face something alone (Sasuke). Upon realizing why Itachi left him, Kareth sobbed furiously, for he was alone again. With his skills he had been taught, and a quest to head back to Konoha, he left.

Personality
Kareth is a very kind and caring person, toward people he likes. No one has to earn Kareth's respect, however they must be able to keep the respect he has for them. Treating him or his friends poorly, of being a general jerk will cause him to respect someone less and less, until he lets you know he hates you. Kareth was never a true leader, preffering to follow those who are stronger than him, yet as the years went on it became harder and harder to find those people. He was broken after his mother died, broken further after Itachi left, and harbors a deep hatred for his cousin Naruto, whom he believes killed his Aunt. He is a very determined man, when he sets his sights on something he doesnt give up, this is the case in a battle to the death, or a battle with his rivalfor the girl he falls in love with.

He became cocky after his kekkei genkai was unlocked, a huge boaster, and a general poor sport. Very competitive, he attempts to make even the stupidest things into a fight, race, or challenge. However he is truely a complex person and has many moods, he is quick to anger, yet holds a soft spot in his heart for Sasuke, who was once his best friend.

Appearance
Kareth is tall for his age and rather skinny, skillfully hiding his strength, and unlike most ninja, he wears mid-shin high boots instead of sandals. he has fair skin and spiky black hair that hangs down to the base of his neck, and bangs that cover the right and left edges of his face, with one strip that hangs between his eyes. His eyes themself are unique - most of the setouchi clan having dull black eyes, Kareth's eyes are bright green.

At first, Kareth is seen wearing a long black robe and hood, when he ambushes Sasukein the woods. Later pulling off the robes to reveal the common vest and pantsuit of a Konohagakure Jounin. He also wears the forehead protector of Konoha on his forehead, just above his brow.

Abilities
Kareth specializes in few of his own techniques, learning most of what he knows using his kekkei genkai. However, he is an excellect sensory ninja, and can distinguish between everyones chakra from a few miles away. His own chakra levels are inconcievable, matching if not besting Naruto's. His main technique is one he copied from Tenten and edited to suit him better, he keeps a broadsword in a hidden location that he can summon at will, and he also has the chakra molding capability to create kunai and small swords from his own chakra. A testament to his incredible chakra control. Also upon seeing Sakura Haruno's incredible chakra infused strength, he use his kekkei genkai to copy and learn that skill.

Kekkei Genkai
The Setouchi Clan is known for their Kekkei Genkai, The Morrigan Eyes (モリガンの目, Morrigan no me). Unlocking this skill is very similar to the unlocking of the Sharingan, and is in fact a very similar eye. One must go through intense emotional distress in order to achieve Morrigan. Once activated, the user's eyes turn bright purple, and their pupils grow two tendrils that reach up and down, in a slight curve. In this first form it is simply called Morrigan, and it vastly increases the user's power, and allows them to copy many simple jutsu, and a few complex ones. As the Morrigan User becomes stronger, his or her eyes can progress into the next stage. Stage two of Morrigan adds two tendrils to the pupils, forming a Swastica-esque shape. This is called Morrigan S. Further increasing the users strength, in this stage it is possible to copy one other Kekkei Genkai, and have it progress as if he/she always had it, however it is very difficult to maintain and the eyes will bleed and slowly weaken the user for as long as the copied kekkei genkai is maintained. The Third Stage of Morrigan adds four more tendrils, now giving the eyes an appearance of a black star shining. Increasing power to unbelievable heights, Morrigan level three is on and equal, if not higher level than stage three Sharingan.

Morrigan users can anvance even further, similar to Sharingan, on an equal leval as Mangekyō Sharingan, Morrigan Prime is in the shape of a pinwheel, and allows the user to copy any jutsu they see. Also, the copied kekkei genkai is able to be sustained with minimal difficulty.

The truely special trait of all forms of the morrigan is that it provides the user with an immunity to all genjutsu, unless said genjutsu is cast by a fellow user of morrigan.

Zerokk, Lord of Destruction
Sealed within Kareth is a dark lord of the world, Zerokk the Destroyer. Zerokk is constantly attempting to influence Kareth into doing his bidding, and in fights that truely challange him Zerokk tempts Kareth with his power, hoping he will take too much, placing the demon in control of his mind and body. Zerokk's chakra is given to Kareth in percents, and often leaks out when he gets angry. Kareth maintains control up to 49%, after that Zerokk takes over. Each 10% alters Kareth's physical appearance.
 * 1-9% - Purple chakra shines around him.
 * 10-20% - Teeth lengthen and sharpen, claws begin to form on fingers and toes. Chakra brightens.
 * 21-30% - A horn on the left side of his head begins to form, as well as a small wing on his right side, skin goes paler. Chakra brightens further. Voices begins to have hints of the demon.
 * 31-49% - Skin pales further, demon voice echos his almost completely, pupils dialate furiously, bones harden and become more prominent.
 * 50-99% - Many demonic changes, two full bat-like wings, two large horns protrude from head, skin turns stark white, irises go red and scleras turn black, signifying Zerokk's control.
 * 100% - Takes on full form of Zerokk the Destroyer.

Part II
Only a glimpse of Kareth is shown at the end of Shippuden, revealing a hooded man with glowing purple eyes.

Trivia

 * The name "Seto" refers to the Seto Inland Sea separating separating Honshū, Shikoku, and Kyūshū.
 * Kareth's hobbies are eating, sleeping, and fighting with Naruto over Sakura.
 * Kareth wishes to fight Naruto Uzumaki.
 * His favorite foods are anything salty and ramen. His least favorite food is anything from the sea.
 * His favorite word is "Winner" (勝者, Shōsha).
 * Kareth's favorite quote is "I'm bored, let's go eat something!" (俺は退屈だ、何かを食べに行こう！, Ore wa taikutsuda, nanika o tabe ni ikou!).
 * Kareth has never completed a mission of any rank.
 * Kareth keeps a broadsword in his home in Konoha, a weapon not usually seen in this region of the world.
 * His favorite season is Autumn.

Reference
Do NOT edit without my permission, thanks!