Tyrphanax said:
He believed he killed Padme, though. And we don’t yet know if he ever found out that the Emperor lied to him.
He found out in one of the Vader comics. Well he found out he had a son; I don’t think it would be too much of a leap to assume Palpatine lied to him about that too. Also Vader was tricked into being a Sith whereas (at this point) Kylo was actually seduced. Darth Vader knowing he had been had by The Emperor was surely instrumental in him rebelling against him.
He’s definitely still going to feel the lure of the light side.
It’s possible but there is this line that leads me to believe he won’t. All of these lines in some form or another is in TFA though some of them obviously were spoken without his mask. All them except “I’m immune to the light”. It’s possible he will still feel a pull but if he does it will be relatively weak. Maybe he’ll feel it when he defeats Rey and in turn gives her a chance to escape.