The Observer

Lizzie Knight is an Observer, which once you review the ridiculously long history of the term (which happens to involve angels, the Fall of Man, a clandestine society founded by the angels, and everything in between), means that she is employed by God's angels for the sole purpose of keeping order in the world. This means that you can find her doing anything from protecting a future politician (who is being stalked by her crazy ex-boyfriend), to fighting with her annoying partners, to kicking demon asses. Definitely not a walk in the park, but certainly not something she plans to stop doing anytime soon. After all, she was just made a permanent member of the Order of the Earthbound, and she has to prove that she belongs.