Gabriel is a half-breed angel-turned human, with a disdain for humanity.
Gabriel has blonde hair and green eyes. Their appearance changed slightly the second time they appeared, their hair becoming a lighter shade of blonde and more curly. At first, Gabriel wore a masculine suit, and at their second appearance they seemed to have changed clothing, now wearing a white top sleeveless top, white trousers, and several wristbands. They do not wear shoes anymore.
Even though they were portrayed by a woman (Tilda Swinton), they are genderless, just as angels are described. They have long dark-coloured wings that appear and disappear whenever they wish them to. As a half-breed, their eyes also tend to change color depending on their mood.
Gabriel seems to be a rather cruel angel. They have a disdain for some of humanity but believes that some can be selfless and noble. Gabriel's plan to bring Hell to Earth was so those who are selfless and noble could rise up, be worthy of God's love, die in selfless ways, and go to Heaven as just reward. Their plan was to get the Spear Of Destiny, kill Isabelle, then take Angela's body as the host of Mammon, then with the Spear unleash Mammon on Earth so that he could build his kingdom of fire and blood. Gabriel seems to also be afraid when it comes to Lucifer, seeing as even before they lost their grace they were trembling before him, paralyzed, and hardly talking, and only calling Lucifer by his other 'nicknames'.
Gabriel seems to dislike John more than the rest of the humans and get annoyed by the way he thinks, such as when he said that because he had saved many people from demons, God should take him to Heaven. Though unlike John, Gabriel reacts calmly without violence. Their reactions, though, were rather sadistic, naming John's cancer as the way he was going to die and go to hell for the "life you took"; referencing John's successful albeit short suicide when he was a teenager.
They could also be called sadistic for when they pinned John down and held their foot onto his neck. Also, a while before doing this to John, they broke a deal (As mentioned by Balthazar) they had made with Balthazar when, instead of resurrecting him, they simply killed him, deporting him back to Hell when they were finished with him, showing that they did not have any care towards their comrades. They do, however, feel shocked and even somewhat proud of John when he refuses to shoot them.
Gabriel cared about God quite a lot, mentioning him often and never forgetting to comment about his kindness. The love they have toward their Father is also one of the reasons they wish to bring the reign of Hell to Earth: because even though God cares about humans more than anything and loves them a lot, they keep doing bad things and sinning, so Gabriel says that they should find their good side and start doing good things. But to do that they should learn what true pain is, because they will only learn how to work together and care for each other during difficult situations.
- Gabriel's wings were burnt off by Lucifer at the climax of the film; whether or not Gabriel is now a fallen angel like Lucifer is unknown.
- It was mentioned by John that Gabriel had a bad sense of humor, based off of the way they talked to him.
- Gabriel was the one that give orders to Balthazar, meaning that they were the one behind Balthazar's actions.
- It was mentioned that they and Balthazar had made a deal in which Gabriel would grant Balthazar resurrection, and in return, Balthazar would serve them.
''I know what you want, son."
''Everything you've ever done, you've only ever done for yourself. To earn your way back into His good graces."
''Your ego is astounding!" (To John, who was pinned down with their foot)
''You're judging me now, John?"
''I'm simply seeking to inspire mankind to all that's intended."
''The road to salvation... Begins tonight... Right now."
''Do you want revenge? Is that what you're thinking right now? Do it, do it... Seek revenge, go on... End my life. Its your choice, its always been your choice." (To John, before handing him a shotgun)
''You could have shot me John! You chose a higher power. Look how well you're doing." (When John refuses to shoot them)