Tengoku (天国 Tengoku?) or Goku (悟空?), full name being Tengoku Yuki (雪天国 Yuki Tengoku?) is an jōnin shinobi of Konohagakure and the only child of Tokuyama Yuki and Shigaraki Uchiha. Due to the situations of the Yuki Clan that involved around persecutions against Kekkei Genkai users, Tokuyama went into hiding and was however followed by the extremists. Before being killed, Shigaraki appeared saving her life, taking her to the Konohagakure where two fell in love and had Tengoku. Born with both the Kekkei Genkai of the Uchiha Clan and the Yuki Clan, he was trained by both parents. The night of the Uchiha massacre, he was saved by his mother after witnessing his father's untimely death, awakening the Sharingan, he choose to attend Ninja Academy and was assigned to Team Hyōsetsu upon becoming an genin lead by Hyōsetsu. Throughout his time as an genin, he would be among the skilled due to his strong chakra being greater then normal - the high expectations as an Uchiha, however he struggled if he calls himself an Uchiha or part of the Yuki Clan. He ultimately chose to "revive" the Yuki Clan in the Land of Fire, hoping by doing this could allow anyone still in hiding to come out and become one clan again. However after the Chūnin Exams he was not only became one of the top fighters, he was promoted to the rank of Jōnin, which lead to him leading his own team.
Assigned as leader of Team 9, he'd became the mentor and father figure as his team consisted of genin who was orphaned. He lead them on some low-level missions until he believed his team can accomplished higher ranking missions. He was soon assigned to protect an carravan convey which escalated in engaging combat against an group known as the Yakuza. The Yakuza, an organization A to even S-Class elite missing-nin, despite that his team was able to take out the Yakuza that's been terrorizin the area and leading to the capture of one of their leaders. His team's action would reveal Yakuza locations and information. However on that same day Pain's launched an assault against Konohagakure, he would engage against Pain and during the fight that lead him to accidently striking down his mother using his Ice Release: Crystal Ice Sword and impaled her. In great distress as her mother died in his arms, ultimately lead to the awakening the Mangekyō Sharingan and casted the Amaterasu jutsu, forcing Pain to fall back as he griefed for his mother, deactivating the Mangekyō.
During his time befoe the Fourth Shinobi World War, he became partners with tokubetsu jōnin Anko Mitarashi during missions of investigations on various criminal parties, including that of Orochimaru and two seem to had gotten closer then one may expect. It was also Tengoku that retrieved and rescued Anko after Orochimaru's revival who left her behind.
After the Fourth Shinobi World War, he'd would be seen attending the mass funeral held in Konoha, and sometime later would later marry with Anko. This soon allowed Tengoku to hopfully "revive" the Yuki Clan in Konohagakure. He soon fathered an child with Anko who they called Hayate Yuki, naming him after Hayate Gekkō to honour him.
Tengoku was born between Tokuyama Yuki and an unnamed Uchiha father. His mother was an member of the Yuki Clan who during civil strife in the Land of Water caused her to flee her home country. She was however hunted down after people reported her, which lead to the Land of Hot Water. She was however consequently saved from execution by an Uchiha member, who taken her to the Land of Fire and into Konohagakure where she was tended to her wounds. As an user of Ice Release kekkei genkai, the Uchiha man would get close to Tokuyama that eventually blossomed into marriage having her first child Tengoku.
Tengoku mostly grew in the Uchiha District with his mother and father. At an young age he demonstrated he inherited the Yuki Clan's kekkei genkai of Ice Release. While his mother was gravely concerned as that specific nature transformation brought great pain and suffering, she embracd it and began to teach him on different Ice Release ninjutsu. However his father taught him the Uchiha ninjutsu and gave him theortical work on their kekkei genkai; the Sharingan.
As an Uchiha, he was rigorously trained to his limit, as the way of the Uchiha in his father's perspective was power and skill, as well utilizing genjutsu in the best way possible. At times he even trained with other Uchiha children including Sasuke Uchiha and other Uchiha members. He was like Sasuke considered an raising prodigy and more so with his Ice Release kekkei genkai. During his training with his mother, he was able to develop an entirely new Ice Release ninjutsu; the Ice Release: Crystal Ice Armour which creates armour made of out Ice to protect him from blunt assaults. During this time however it was underdeveloped and he could only do it on his lower arms and parts of his upper torso. His mother was excited to see her son developing an new ninjutsu for the kekkei genkai that caused prejudice. With his father he had successfully learnt their Fire style ninjutsu with his father commenting while he still needs thing to learn, he's an excellent Uchiha child.
However on one faithful night, Tengoku was awoken as his father was standing above him, but he noticed something else right, his father's right arm was bleeding. Before he could act, his father back erupted as the blood spilled on hi, his father head's also rolling off as the body fell. Confused, even trumatized as he finally register his father was just killed in cold blood, even worse finding out it was none other then Itachi - awakened his Sharingan. However Itachi was inches away in killing him but the air became cold as an barrage of ice needles flews at Itachi at high speeds, causing him pull back. His mother Tokuyama was here to stop Itachi from killing her only child, using her Ice Release to defend herself. She called out Itachi as an betrayer and used Ice Release: Crystal Wall to block Itachi and to escape from the district with her son. Carrying her son as fast as she can, she was able to leave the Uchiha district and hide where the next morning she revealed herself with her child.
After the massacre and one of the two surviving Uchiha, he told his mother who was still grieving for the loss of her husband that'll get revenger for her, avenger his father and avenge the entirety of the Uchiha Clan. However because he still had mother while Sasuke lost everyone, he applied to the Academy where Sasuke was attending and tried to "connect" anyone would when losing Clansman. However his voice was basically ignored by Sasuke, who only seeked vengence upon his brother Itachi. Seeing as no use, he'd would study alongside the other students but purposely held back in order to not "get attention" as he noticed Sasuke's skill was gaining attention, something he did not want. The only attention he gotten was due to his Yuki Clan heritage and the fact he possess two kekkei genkai, something that's out of the normal.
Chakra and Physical Prowess
Tengoku awakened his Sharingan on the day he found about his father's death and the slaughter of the Uchiha Clan, however like Sasuke he was unable to use it for several years. It was revealed his Sharingan was an potent Dōjutsu under his control, enabling him accelerated his thought process and his skill against more experienced and trained shinobi. Throughout his years as genin, it began to full matured to grant him the name as Tengoku of the Sharingan (写輪眼のサ天国 Sharingan no Tengoku?). Due to Sasuke, the two were called as the Sharingan Brothers (写輪眼のサ兄弟 Sharingan Kyōdai?). As Sharingan is an visual jutsu, it increased his overall reflexes and perception to track high-speed objects and even can predict movements he sees (his own physical skill permitting), including seeing the flow of Chakra. Like any other, he can utilize Genjutsu, specifically Genjutsu: Sharingan which were more stronger then ordinary Genjutsu techniques. By an glance into his eyes, Tengoku can capture into Genjutsu, and even perform what he calls "telepathy", using the Sharingan to relay information to others and enter subconscious and the psyche plane. However it was shown he can not wipe people's memories like Sasuke can.
Tengoku awakened what's known as the Mangekyō Sharingan after he killed his mother during Pans assault, the only family he had since the death his father and the entirety of the Uchiha Clan. It's design takes it shape an pentagram with an four-pointed star in the middle. Awakened, he was able to utilize Amaterasu, though before his father was able to tell him what it is prior to his death, and how it deteriorates eyesight with every use. His father apparently promised that when the time comes, he'll transplant his eyes into Tengoku to gain the "eternal" Mangekyō, though this never came to b til the Fourth Shinobi World War where he was given his father's eyes by Kakashi Hatake and awakened the "eternal". The Eternal Mangekyō Sharingan has an drastic change in appearance compared to his normal Mangekyō is more shaped towards Obito's, with three triangles with two tomoe with its tail forming an circle. This enhanced his overall mastery with jutsu. Like Sasuke, he'll be greatly fatigued with extended prolonged overuse of the Mangekyō before gaining the eternal. Since awakening the eternal, he had shown no fatigure signs with extended use.
With his Mangekyō Tengoku has access to unique jutsu only to the Uchiha, with his right eye he can utilize the Amaterasu, where anything is at his focal point of his sight is ignited in black inextinguishable black flames that can burn anything. On his left eye he can Kagutsuchi to manipulate the black flames to give form via shape transformation, only Sasuke Uchiha holds the same ability, an rarity even in the clan for two to have the same abilities. It's been said he's on the same level as Sasuke due to Kagutsuchi allowing him to manipulate the flames at will. As he awakened the Mangekyō in both eye he as also gained access to the Susanoo, an spectral chakra-formed being as an "ultimate defense" technique with an will on its own. Repeated useof the Susanoo is required before he can fully formed it to its completion. He steadily and stragically used Susanoo due to the implications and drawbacks, as he continue to form the ribecage, he began to gain the muscular structure and skin which eventually gained armour. Unlike the other Susanoo, Tengoku's possess four arms with four more added upon awakening the Eternal Mangekyō.
Like any other Susanoo, Tengoku has access to at least seven swords at its disposal, and this is where uniqueness comes into play. He possess seven unique that holds an varity of unique jutsu attributed to those swords, and during the Fourth Shinobi World War, he was given the Sword of Totsuka from Itachi Uchiha as his seventh and final sword. The swords are as followed; the Sword of Muramasa, the Sword of Dōjigiri, the Sword of Onimaru, the Sword of Mikazuki, the Sword of Ōdenta, the Sword of Juzumaru, but he does not possess any long-range weapons like Sasuke does. He can channel the Amaterasu through the six of the seven swords, and even utilize the Amaterasu in an wave strike against his foes. His strongest jutsu is referred as the Sword of Indra which combines all seven swords as an singular Norimitsu Odachi sword.