Are you good, neutral, bad?
Are you human, vampire, cyborg, etc.
Who trained you or how did your powers awaken?
Which era do you live in(1800's, 1900's, 2000's, etc.) Where are you from and live?
Do you fight with hamon, a stand, or both? Or do you have some kind of special abilities?
What do you look like? What does your stand look like?
What techniques do you use?
What kind of pose do you have?
Any allies or special relationships?
What adventures do you embark on?
Feel free to go beyond these questions!