Orochimaru
Original Orochimaru
The original Orochimaru is the basic enemy during a long time in the original Naruto series.
He is basically the arch-enemy Naruto has, before Sasuke's actions.
Orochimaru was a former Legendary Sannin and student of the Third Hokage. There was a problem, Orochimaru had a desire for power within him. Thus, he left the Third Hokage's side. Orochimaru still attempted to gain the title of Hokage, but he was looked over as a candidate
Orochimaru in SL
Being depicted as almost invincible, Orochimaru makes a good template for what is normally in Lotgd the Final Boss, the "Dragon". In SL Orochimaru is the Final Boss you need to defeat in order to achieve a new rank.
After defeating him, you will be reborn, stripped of all gold, weapons and some other possessions, starting again at Level 1, but with 1 more Orochimaru Kill and possibly a new Orochimaru Kill Title as well.