Okay. There might be a weird problem here.
I actually tend to destroy my characters of questionable nature and am very skewed towards humble personalities. I do have one boy from a pretty wealthy family who is also pretty arrogant but a main part of his personality is that he desperately tries to hide it and forces himself to be humble (while failing), soft spoken, and pretty much a wallflower.
I have a pretty prideful doctor who works with the cops but I'm not sure if you'd want to work with an adult in this situation.
And then, I also have a nice guy who's currently being led astray to the path of vigiltante anti-hero. For the time, though, he's just a young boy who wants to help people and is willing to do questionable things.
(The characters, in order, are Saitou Yuzuru, Michelle Taylor Ashworth, and An Nam Il in my signature)