Gabe

'Gabriel/Gabrielle (aka "Gabe") is an Angel and is therefore physically genderless. He/She has no free will and there is an unknown force that drives him/her to do good and protect the innocent; Gabe assumes this force is divine. Gabe hates not having any free will, so he/she tries to get rid of this instinct by drinking, smoking, and gambling. He/She collects various religious artifacts and believes in all religions at the same time.'

(As according to the official site.)

Further detail
Gabe has been shown to be on relatively friendly terms with The Grim Brothers, playing poker with them on occasions and The Bloodcarver, who confessed to him/her his worries for the future.