Main protagonist becoming an evil person later in the anime

[Blackangel]

what do you say to this?
and i am sure there are always moral conflicts this way and death note is like that too. lol

 

[Burnsy]

Light was always evil. Sasuke turned evil in shippuden so him.

 

[Rinko]

I am not completely sure.
You wouldn't get a Star wars reference here and I am yet to watch too many anime, to come across this situation in any Anime