Sharingan

The sharingan literally meaning 'copy wheel eye' is the dōjustu kenkkei genkai of the Uchiha clan in the series Naruto.

progression
The sharingan has seven progressions(only in manga) and six(in the anime).

The first three are based on magatama these give them their shape.

MongekyouAfter the thrid form is achieved a Uchiha can either gain the mongekyou by, killing his/her friend or by having enought hatred in their system as the sharingan are powered by hate in the minds of Uchihas.