What do you think gives us different personalities ?

How we were brought up = environmental factors

How our brains and bodies function= environmental+ nature/ genetics

What we have in the present and who we surround ourselves with= environmental.

Consciousness and subconsciousness mechanisms= environmental again and the cognitive choices we make from those available( limited will).

Nature/nurture.
Some traits are likely inherited. Some we come to by our own self-discovery.

Most likely all that - With occaisonal help from drugs & alcohol.

Different Genes passes on from Generations

Our environment mostly :) but it can be many things

All of the above and much more.

A mix of nature and nurture

Yes, yes and yes.

Yes to all 3

Yes

Yes.