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If Libra is rising, Venus is your AC ruler, and if it's in your third sign, not just your third house, it's sextile the AC by sign (and possibly by degree, if it's within orb), which would mean it supports the AC. If it's not in a sign that aspects Libra, Venus still affects everything your AC stands for, including how you appear to others, but it's not as direct an effect.
Generally, Libra and Venus indicate pleasantness, fairness, getting along well with others. This may be modified by Venus's sign placement and any aspects it makes, and by any planets in the first house, but no matter how it's modified, I would still expect the pleasantness, fairness, and getting along with people to be your underlying image.
Maybe you also meet the world as a Plutonian, Saturnian, and Jupiterian individual, but you're a pleasant Plutonian, Saturnian, and Jupiterian individual who gets along with people. Since these are the "big" planets, and Pluto in particular deals with power, quite possibly you experience a lot of issues around power, either your own and how you wield it, or how you encounter it in others.
The third house is also perception, and when your ascendant ruler is there, issues of self perception are likely to be up for you. Maybe you don't perceive yourself as pleasant or fair or good looking, or even decent looking. Maybe you tend to believe that you're ugly, or that others don't like you, or just that you are, in some way, not good enough. If you do hold any variation of that belief, that's a self perception issue.