She's just really genuine, and realistic, but still sees the best in everyone. Her outlook on life is very... Open.

[It's difficult to describe just what Angela is really like, but that's as close as he can get.]

I'm um, not actually sure how she was hired, but she works at the Jeffersonian Institute, not the FBI; I think Dr. Brennan just knew her and knew she was an artist, asked her to help with a facial reconstruction, and then she ended up keeping the job permanently. But she's also really good with computers, so she's important to the team that way too.