Okay Doc. Crack those knuckles and tell me how the character’s roots affect their psyche. Here are some questions to consider:
Is your character aware of their flaws? Do they care?
Are they a pushover or proactive?
What is their general outlook on life? Are they a glass half-full or half-empty kind of person?
Do they have an active imagination?
Would they be considered an introvert, extrovert, or ambivert?
Are they lazy or ambitious?
Do their morals align more with good or bad?
Are they easily frustrated, or laid back and relaxed?
These are questions I feel you should answer TWICE. First, answer how the character would answer. Then think about how other characters would answer ABOUT them. Sometimes, how we see ourselves is different from how others would see us. If the answers are different, ask yourself why.