The second part of personality podcast looked at a number of ideas of personality development. One of the ideas was that there are a large number if theories that have basic validity, but no solid proof. The Big Five and the more recent HEXACO theory have perhaps the strongest statistical validity, but not a dead certainty of personality shaping.
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Here is the brief summary of theories that Ralph mentioned: https://www.researchgate.net/publication/338543409_Personality_Theories_A_Brief_Overview/link/5e6b8b29458515e55576bc52/download?_tp=eyJjb250ZXh0Ijp7ImZpcnN0UGFnZSI6InB1YmxpY2F0aW9uIiwicGFnZSI6InB1YmxpY2F0aW9uIn19
