You may have wondered how people come up with Original Characters with a functioning personality in the past. You may have also left your mouth agape when you saw someone have their Original Character react negatively to a spider at one moment, then hug their spider anthro friend in the next. Well, it's really a simple process that requires one thing so rarely used these days; thought. I'm expecting you have a general idea of your character at this point and are seeking to deepen or improve their personality now. If so, you can skip a few steps.
Step one: Build a base for your character.
All things are built on a strong foundation.
Find the center of your character's mind, their motivation in life, and their drive to keep breathing (if that is indeed what they do; not all characters are human).
Something simple like "Survival," will more than suffice, as an existence like this will lead to self-conflict of yearnin