Do Du think Peeta every gets his personality back? - Mockingjay Book

Yes, definitely. It probably took awhile because he probably had to let part of it come back on its own. And, while she was still alive, Prim suggested that they Hijack him back and twist his memories back into what they truly were.

Yes well at least he almost gets back to normal but he proves that he's still there wen katniss says stay with me and he says always! It is also revealed that katniss and him get married and had a girl and a boy.