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human
[Star Wars] Did Vader become essentially a different person due to the dark side or emotional/mental trauma?

Vader fell *hard*, to the point that he rejected his old identity. Was it nearly total corruption from the dark side (to the point that it almost seems like he was possessed) or did everything he went through drive him batshit crazy? 

I'm sure it could be a bit of both, but Vader's personality change seems extreme compared to other Sith. 

Edit: Something else to add: Vader goes very quickly from astonishment at what's he's done to Mace Windu to murdering all his colleagues. Again, kind of a possession vibe here. This is before Mustafar, so again - is this normal for the dark side or is Anakin losing his mind?
gpt
i think thats what it was always supposed to hint at, that when anakin ended up in the suit at the end of episode 3, that he was so broken mentally, especially due to padme's death as well as the lie that his children had died, that he pretty much believed anakin skywalker was dead and he was now darth vader.