Fire Release: Rasenbakuha

The Fire Release: Rasenbakuha is a variation of the Fire Release: Great Flame Rasengan, a further evolution of the original plan of fusing elemental chakra into the Rasengan, created by Jiraiya. The user generates a Rasengan before forming a layer of Fire Release nature chakra over the sphere, the fire fusing into the Rasengan. The result changes the sphere's color from blue to a pure white, a spiraling sphere of orange-red flames swirling around the Rasengan. Like a bomb, the Rasenbakuha can be thrown a short distance of up to five meters, however, when initially created, the user had to get in close to the opponent in order to use it. If the attack is successful, it releases a storm of spiraling flames that expand across a ten mile distance from the impact point, incinerating any victims in close range and inflicting heavy burn damage on opponents further away within the range of the attack. The attack also releases a 'rain' of embers that descend onto the battlefield across a ten-mile radius, each ember capable of inflicting light burns upon impact; adding to the attack's destructive power.

As Itachi Uchiha commented when the jutsu was used for the first time against him and his partner Kisame Hoshigaki, despite its failure to kill either of them due to their use of cloning jutsu to set up replicas to take the fall, the jutsu represents Jiraiya's devotion to the teachings of the Hokage and Konoha: the Will of Fire.

Drawbacks
As stated by Jiraiya himself, the Fire Release: Rasenbakuha is imperfect. Because of the vast amount of Nature Transformation required to use the jutsu, the constant conversion of chakra in one's body into the Fire Release results in Jiraiya's body temperatures increasing substantially and decreases his stamina. Furthermore, the release of the fire chakra upon impact, when initially used, resulted in Jiraiya's arm being inflicted with severe third-degree burns, burning away the majority of the skin on his arm. It is because of this that the Fifth Hokage Tsunade declared the Rasenbakuha as a kinjutsu. Jiraiya later rectified this by finding a way to throw the jutsu a short distance.

Development
Jiraiya's student, Naruto Uzumaki, later found a way to throw the jutsu a further distance, up to ten meters, through using senjutsu chakra to increase the body's physical strength (allowing Naruto's ability to throw the Rasenbakuha be able to reach further distances) and Wind Release chakra to direct the attack and propel it forward. This combination of wind chakra later inspired Naruto to create a further evolution of the jutsu: the Fire Release: Chōshinsei Rasengan.