Within the world of Naruto, elemental jutsu deeply influences a shinobi's abilities. Every character seems to go in for one or more nature transformations, though few are as destructive as fire release, or Katon. As the story develops, it will become apparent that various characters show evidence of the use of elemental techniques, but none more obvious than Sasuke Uchiha, who has used fire release since early childhood years. Sasuke's fire jutsu develops extensively in the series, thereby making it one of the main bases of his fighting style. This development shows not only his skill but also his growth as a character and shinobi.