Disclaimer: All publicly recognizable Naruto characters, settings, etc. are the property of Masashi Kishimoto and Shueisha Inc. The original characters and plot are the property of the author. No money is being made from this work. No copyright infringement is intended.
Prologue
Fire...
Water...
Earth...
Wind...
These are the four main elements of Chakra, with the Lightning element being rather rare and limited to clans and countrymen from the Land of Lightning.
However, there is more to these elements than just their components... Their synchronization and their eternal equilibrium have been the main focus and poetic envy of many tales and legends.
Like the Ying and Yang philosophy, they both clash and flow with each other...
The obvious example being fire and water, they both clash together to form steam and it is a violent reaction reminiscent of a lion's roar, nevertheless this war of molecules is necessary, lest the world drown or be set ablaze by their carefree arrogance.
These examples are generic at best; a more specific example would be the story of our Orange Hokage and his wonderful wife...
The Orange Hokage's passion is like that of fire, spontaneously energetic and likely to be out of control. His wife is like water, normally calm and collected, but ready to react violently with that same fiery passion.
His wife is also like the earth; she has a naturally kind nature and can be forgiving, but when her trust has been crushed she takes revenge on those that crossed her. That's why the wind, and its carefree nature that would usually antagonize her, can also soothe the wrath of a vengeful tremor with a serene grace that only air could manage.
But I digress; this is the tale of their legend...