You'd have to look at someone's entire natal chart at their moment of birth. A general sun sign isn't considered meaningful really, until you really get to know someone; who in turn must be fairly authentic. Especially considering how many people exist in various states of self-denial and cognitive dissonance.

I'm an INTJ and astrological natal charts have fascinated me because of the seeming accuracy I've noticed between charts for different individuals. I think it's "neat" when things correlate (especially for one person and not another) and I can see the connections with more "statistical" scientific measures of...personality or characteristics in the general population. I think it is egotistical to assume we understand everything based on preconceived ideological boxes (can anything even exist beyond hybrids of intuitions and reason?), but I am not worried about "subjective" information for myself. I consider us processing systems and theories, idea, methods in the external environment are not the problem, but how we process them. If you go looking to identify with certain things, of course you can assimilate them into your self-concept, but recognizing patterns of behavior across a variety of contexts is fun to me. If there is information out there, I want to understand it. Period. Don't care how mystical/irrational it seems. If things correlate based on a proper understanding of systems, I think that's interesting and I'm not attached to the outcomes aha.

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Some interesting areas to check out in your own natal chart for fun:

House where: Saturn/Pluto/Venus are

Ascendant sign

Mercury/Moon/Venus signs