Supreme Leader Snoke (Shadow North)

"THE Dark...AND The Light"

- Snoke "I WAS Supposed to be the choosen ONE....I WAS SUPERIRO TO THE WEAK SKYWALKER!!!!!"

- Snoke

'Snoke (Originally Known as Mace Windu) was once a jedi and a heroic one.Althought despite of being heroic once he used to belive that he was the choosen one and even looked down on others that were considered to be the choosen one,he looked down at Anakin for example.

Jedi
He used to be an jedi before turning to the dark side.He defeated many evil villains like Jango Fett and was a true hero in the clone wars.However All of this would change with the encounter with Sheev Palpatine.Where he would go so far with using the dark side of the force to kill Palpatine.Even Anakin himself knew that this was not the jedi way (althought he mostly defended Palpatine for the sake of Padme)and said that Palpatine needed a trial.

Fall To The Dark Side
After loosing the battle with palpatine and got his han cut...he started to feel a deep hatred for the skywalker bloodline rather more than Palpatine himself.Despite the fact that Anakin`s children were good and Anakin killed Palpatine,it still did not change his extreme point of view of the Skywalker bloodline.Therefore all his anger and hatred turned him more corrupt until he became a sith.