It is really hard to determine whether Riddle was born that way or if he became that way over time. From HBP you get the sense that maybe he was born like that because he seemed to take pleasure in hurting others at an early age. Harry had an upbringing that was just as horrific if not worse than Riddle's. In light of the revelations of HBP, then I have to go with Riddle being practically born that way. His entire family was so inbred that they were nothing but brutes and snobs. Even his muggle father was not much different from this model.
no subject
Courtney//Hufflepuff