In Abrahamic religion (which encompasses Christianity, Judaism and Islam), Gabriel is a high-ranking archangel second only to Michael. His/her name means "Master who is of God" and is known to be the left hand of God and the embodiment of the Holy Spirit, in contrast to Michael who is the right hand of God. To Christians, his/her primary task is that of a messenger who told Elizabeth that she would bear John the Baptist and the Virgin Mary that she would bear Jesus (meaning he/she is remembered each Advent as the messenger of the Immaculate Conception.) By Muslims, he/she is especially noted for revealing the Qur'an to Muhammad and for being the messenger that tells prophets of their obligations.
While typically thought to be male or of a neutral gender in early texts, some schools of thought believe that the portrayal of Gabriel's feminine face in art denotes that Gabriel is in fact a female angel. This may be in contrast to Michael's male role as the right hand of God, but the subject is still largely debated in religious circles. When portrayed as a female, she often holds a lily, suggesting her gentle feminine nature.
Gabriel is one of 3 Seraphim that could join you in the Law path, stating that you and your partner are the new Adam and Eve. When Michael says you will need the Angel Ring, you need to fuse her, Raphael, and Uriel to make it. In the Neutral and Chaos paths, she calls you a sinner and is one of the bosses pre-Michael
Shin Megami Tensei II
Once Uriel, Raphael, Michael, and the fake YHVH are defeated, the remaining Senator reveals herself to be Gabriel, who was told to distance herself from the others by the orders of the One God, the real YHVH. If you defeat the real YHVH on the path of Law, she states that you still have a purpose, and tells you to go to Eden.
Shin Megami Tensei III: Nocturne
If you are against Chiaki's (or the female classmate's) Reason of Yosuga, you are forced to fight against Uriel, Gabriel, and Raphael. Otherwise, you fight Futomimi. Afterwards, you can fuse a Throne with Raphael to get her.
Digital Devil Saga: Avatar Tuner 2
Five years ago, members of the Karma Society captured four devouring angels. Their minds have eroded to the point that they start questioning if they're human. But then their demon memories kicked in, which ran parallel to Shin Megami Tensei II, including the building of the Millennium Kingdom and turning betrayers to stone. Then they would attack because they can't control their thirst. You fight Gabriel, Raphael, and Uriel twice, once when you find them by themselves; and once in a single battle, facing each one of them and the finally Michael, one at a time.
Light electric damage to a single enemy. May cause shock.
3 MP
Default
Maziodyne
Heavy electric damage to all enemies. May cause shock.
25 MP
Default
Blight
36% HP
88
Persuade
89
Elec Boost
Increases potency of Elec magic by 50%
Passive
90
Radiance
Heavy expel damage to all enemies.
30 MP
91
Persona 3
Skill
Effect
Cost
Level
Bufudyne
Inflicts a large amount of Ice damage to one enemy.
16 SP
Innate
Mahamaon
40% chance of instant death from the power of Light to all enemies.
24 SP
Innate
Hama Boost
Hama skills are 1.5 times more effective.
Passive
Innate
Mabufudyne
Inflicts a large amount of Ice damage on all enemies.
32 SP
64
Repel Dark
Able to repel Dark attacks. Takes precedence over Resist and Null Dark.
Passive
66
Myriad Arrows
Hits 1-2 times for a moderate amount of Pierce damage with each hit.
19% HP
68
Persona 4
Skill
Effect
Cost
Level
Mabufula
Inflicts a moderate amount of Ice damage on all enemies.
16 SP
Innate
Mediarama
Recovers a moderate amount of HP to all allies. Can be used in the field.
12 SP
Innate
Energy Shower
Recovers Exhaustion and Enervation from all allies.
18 SP
45
Survive Dark
50% chance of retaining 1 HP after suffering first hit by Dark attack
Passive
47
Heat Wave
Inflicts a moderate amount of Physical damage on all enemies.
16% HP
48
Divine Grace
Persona's HP-restoring skills become 50% more potent
Passive
50
Gallery
Gabriel as she appears in "Persona 2: Eternal Punishment"
Gabriel as she appears in Persona 3
Gabriel as she appeared in Shin Megami Tensei
Trivia
Aside from Jesus, who appears in Persona 3 as Messiah, Gabriel is the only Persona actively involved in one of the Mysteries of the Rosary (the Annunciation is the First Joyful Mystery, with its fruit considered to be humility.)