Maybe someone can come up with a story where the MC grows up always being able to see aural colors around people. Initially MC has no idea what they are or that no one else can see them. Eventually MC learns not only how to decipher what the different aural colors and patterns mean but also how to influence them. By influencing the colors and patterns of a person's aura, the MC can drastically change a person's personality, mental state, emotions, and thought patterns. Discovering this brings up a moral conflict for the MC over when and how this ability should be used and when it should be avoided (both for moral purposes and to prevent detection). The discovery and growth of understanding about the MC's abilities should be gradual over the course of years of experimentation. Also, how would all of this affect the MC's life?