Flying Thunder God Jutsu (
Official Version)
Space-time ninjutsu surpasses the concept of space and distance, allowing one move instantaneously from one location to another marked with a jutsu formula without physically occupying the space in between. The Summoning Jutsu is the oldest and most well-known example and is used to summon animals, people and objects to the caster.
The Flying Thunder God Jutsu was the first space-time ninjutsu that lets the user summon
themselves to another location instead of summoning others, and doesn't originate from the bloodline of the Sage of Six Paths are capable of the same.
The first part of the jutsu is to mark a location with the jutsu-formula that serves as the destination marker for the ninja. Forged from their chakra, it is an anchor that binds them to their original world to prevent them being lost as they jump between dimensions. The second, more difficult part of the jutsu is for the ninja to use their chakra to jump though space and time outside of their dimensions into a substance and then return to the marked location. The moment they disappear from one location is the moment they reappear somewhere else. This teleportation is also ble to affect anything that is in contact with the user or connected to their chakra, meaning that they can teleport other objects or people, and the size of the object dictates the amount of chakra required.
The jutsu has a suprisingly low chakra cost given its ranking because the caster is transporting themselves rather than another object or entity, giving it a large number of uses. Its S-ranking comes from the complex transformation of chakra used to manipulate the space-time continuum that makes it incredibly difficult to learn and use. And even if one was to learn to use it, most would not have the reflexes and reaction time to be able to use it to its maximum potetial in combat. Only two shinobi in history have ever learned it and that they could use it without a single hand-seals speaks highly of their abilities.
It was invented by the Second Hokage, Senju Tobirama, in his pursuit of fighting styles best suited to combat the Uchiha Clan as a space-time jutsu renders their Sharingan's precognition meaningless. Tobirama was known as the fastest shinobi of his era for being able to travel instaneously, using the jutsu both in and out of the battlefield to great effect. He would often mark his opponent with a jutsu-formula while engaging them in close combat to provide him with an inescapable advantage as he could teleport from anywhere directly into their personal space to attack, overwhelming them with attacks from any and all angles. Even if he couldn't mark them directly, he could add the easy-to-miss formula to his own weapons during the fight and transport himself using their locations instead. Unfortunately, Tobirama was limited in how many jutsu-formulas he could maintain at once and could only last for a certain length of time which meant that he was better of only creating his markings during the battle itself then removing them afterwards.
The jutsu was then learned and perfected by the Fourth Hokage, Namikaze Minato, who refined its ability to traverse space-time to improve its effectiveness. As a result, the jutsu-formula he creates differs significantly from Tobirama's in design to reflect the changes he made for the jutsu; this version is permanent unless physically destroyed or removed by Minato and he can create and maintain many more of them simultaneously. This was a crucial part of his Minato's signature tactic which was to throw his marked kunai all over the battlefield to transport himself wherever he needed to be whenever he needed to, and the sheer threat that he could travel to the heart of the enemy's territory using that small marking earned him a fearsome reputation. Minato's greater understanding of space-time ninjutsu from his efforts even allowed him to create several other jutsu based on the concept.
Related Jutsu
Flying Thunder God Slash - Tobirama marks his opponent with a jutsu-formula, uses teleportation to enter their blind spot and, faster than the eye can see, thrust his blade into their vitals. It is the ideal assassination jutsu.
Flying Thunder God Mutually Instaneous Revolving Jutsu - This jutsu was designed to be used in conjunction with the Shadow Clone Jutsu. As the shadow clones are made from and connected to Tobirama's chakra, he could strike one of his own clones which would trade places with another in contact with his enemy to turn it into the victim in a way it cannot defend against.
Flying Thunder God Dance - Minato throws six kunai around his enemy and uses them to instantly teleport from one to another faster than his opponent can keep track of it. Being hounded by one of the fastest men alive from ever side guarantees an opening in the enemy's defences for Minato to capitalize on with a lethal strike, usually in the form of the Rasengan. Technically it was named the Spiralling Flash Super Round Dance Howl Style Three but Minato, its creator, is the person willing to call it that.
Flying Thunder God: Second Step - This is the next step up from the Flying Thunder God Jutsu which transports Minato to a jutsu-formula that is in motion instead of fixed to one location. He throws his kunai at his opponent and teleports to it while it is still in flight to vanish from the opponent's eyes and strike at them from an unexpected angle.
Flying Thunder God: Guiding Thunder - This is a space-time barrier jutsu based on the Flying Thunder God Jutsu. Using one of his tagged kunai, Minato opens a tear in space-time which instantaneously sucks in an incoming attack and transfers it to another location marked with the jutsu-formula. Minato can create the tear anywhere within his immediate vicinity and its size can vary to accommodate the size of the attack used against him or others The jutsu is especially dangerous when he chooses to transport it to a person that he has tagged instead of a kunai, meaning that the target has no way of expecting the attack or defending themselves.
Flying Thunder Formation - This is an alternate version of the Flying Thunder God Jutsu meant to enable lesser shinobi, ones unable to learn the S-rank ninjutsu themselves, to accomplish the same effect. It requires three casters who made a circle and each perform the seal of confrontation to link them together. They then break down the complex chakra transformation required to traverse space-time into three parts with each member handling one part in unison with the other, like how Naruto would use a pair of clones to create the Wind Release: Rasen Shuriken. Doing so allows them to transport themselves and/or anything inside the inside the confines of the ring to a marked destination. Minato invented the jutsu and taught it to the Hokage Guard Platoon, a team of three special jounin that he put together. Their purpose is to come to his aid in an emergency (possibly with other allies when needed) or protect an important target designated by the Fourth by transporting them away with the danger zone.