Would it be possilble for a character to have an inner conflict thing. (EX) If you were a Sith and your character feels wrong for all their wrongdoing as a Sith and decide to become a Jedi?

NOTE: This is simply a what if question

yeah of course, it depends on the situation of course but take your example, if a Sith feels his doing wrong of course he can turn to the Jedi though he wouldn't immediatly be a Jedi, he would have to re-train.

Yeah I agree, even our own personal characters have inner conflicts. It makes them more interesting and detailed so feel free to add such things to your character