the most boring characters are those written with the express intent of not being boring - to avoid giving another "do what you want" reply (even though you really should just do what you want) I can list off some questions that I ask myself when I'm first setting up a RP character - maybe they'll help you idk
What's the basic, overarching concept I'm aiming for here?
Is this workable within the setting's bounds? (don't fuss too much about this but many roleplayers are strict about lore)
Can I play this well? (if the answer is no, this isn't a reason to trash the idea - you just might need to learn a bit more)
How will this character interact with others? (important - most people don't have a lot of fun rping with themselves)
What drives/motivates them? (this is how you find plots!)
Will I enjoy playing this in the long run? (this one's very important to avoid burnout!)