Madara Uchiha
Uchiha Madara was co founder of the Hidden Leaf Village and one of the most powerful ninjas of his time. Madara at the time was the leader of the Uchiha clan, one of the two most powerful clans of the time. The Uchiahas possessed the sharingan which gave them great skill in a battle, the sharingan is a jutsu the Uchiha are born with. The sharingan is an eye awakened when in a dangerous situations, it allows you to see chakra flow, follow or notice small movements, copy movements, count almost any number of things, and cast illusions known as genjutsu on anyone with ease. The Uchiha clan was one of the many mercenary clans of the time, therefore Madara always spent time honing is sharingan. Madara always competed with his younger brother Izuna, always training searching for a greater power. Both Madara and his brother discovered a greater power, they both killed those closest to them to achieve a higher level of the shringan, the "Mangekyo" shringan. The mangekyo allowed you to use several special abilities: First to use tsukuyomi, a genjutsu so powerful to the victim it may seem he is being tortured for days while only a few seconds have past, leaving the target paralyzed with fear not able to move for sometimes over a week. The second power amaterasu, a black flame said to be as hot as the sun with the ability to burn anything(water, stone, or even normal fire), and never extinguish. The third ability named susanoo, an avatar that appears around the caster, it is extremly hard to penetrate and even when hit in a weak spot the caster my just be thrown, but unscathed. The fourth ability and the greatest, the power to control The Nine Tailed Demon Fox(Also known as the kyuubi for short). The kyuubi has immense power and is more powerful than any of the other tailed beasts, it can release a blast called a bijuu-dama that can annhilate a whole city. Madara though overused these powers and eventually turned blind leaving helpless and sick. Madara eventually took his brother's eyes and implanted them into himself. Madara aquired a new power called the Eternal Mangekyo Sharingan, which allowed him to be able to use his powers without any side effects. Madara was hungry for battle against the other most powerful clan, the Uchiha's eternal rivals, the Senju. The Uchiha and the Senju though were both hurt and their battles resulted in many causalities. The two clans decided to make a peace treaty. Madara at first didn't accept the will of his clan, with his newly aquired powers he could defeat the leader of the Senju, Hashirama Senju. But both clans didn't want this and the Hidden Leaf Village was founded.
Mangekyo
Madara
Amaterasu burning regular fire
Susanoo