'nobody can truly stay clean in the real world, and the grown-up way to look at the world is to accept that everyone is kinda bad.'
Yes it can be a little disheartening to realize all humans have a mix inside them. The issue was explained way back in the 1966 Star Trek episode, "The Enemy Within", wherein Captain Kirk gets split into two entities due to a transporter malfunction. One split avatar was modest and rationale but rather weak-willed, whereas the other was primal and fearful but also strong-willed and rather lusty. In the end, the two halves come back together in their proper balance, guided by Kirk's intellect and choice, and all the wiser from the experience.
Based on this thread, it is not clear to me how Larian regards good & evil. Their approach certainly is not simplistic, which keeps things interesting. So I would look for some defining traits which will probably evolve over time. For example, our characters may come to realize that true evil does not forgive.
