I was composing an answer for you and was about to begin by apologizing for no longer considering this a debate. Then I searched nature vs nurture debate and found this on Wikipedia: "In their 2014 survey of scientists, many respondents wrote that the dichotomy of nature versus nurture has outlived its usefulness, and should be retired."
So I'll skip the apology, although the debate does lead to useful distinctions for categorization.
A few broad observations by me:
1) About 3% of humans born are "broken." (Sociopath, psychopath, etc.)
2) Infants (0-9) show distinct "personality" differences, at least in a very general sense.
3) One of the keys to success seems to be being a person with high self esteem. Parents are capable of having a great effect on the development of their child's self esteem by how they treat them as they grow---they can "nurture" it (there's that word) or stunt its growth.
4) All of us are vulnerable to the possibility of random trauma and may need professional help to recover from such an experience.