Barbiel is an angel that appears throughout the Demon Accords novel series. He is also the handler of Chris Gordon throughout the Demon Accords novel series.
Initially, Barbiel is somewhat ignorant of how to interact with humans. Overtime, he slowly grows closer to Chris and becomes more than just a "case worker" as he initially describes himself.
Barbiel has many limitations placed upon him in order to avoid a breach of the Accords. He frequently will lead Chris to find the solution to his problems through innuendo and hints. Barbiel is typically invisible to anyone other than Chris but has revealed himself with permission at times, even going so far as to appear for an interview.
Barbiel is described as being inhumanly beautiful. He possesses a set of angelic armor and weaponry which has been used to dispatch demons that dare step onto holy ground.