Gabriel, also known as Loki or The Trickster, was the fourth and youngest of the four archangels created by God. Despite the fact that he was the youngest of the archangels seen on the show so far, he was still very powerful. Gabriel was very compassionate towards his family. Although he was the very first celestial to be seen on the show, he was the last archangel to be revealed.
According to Gabriel, The Apocalypse was an issue he had to cope with on a daily basis. When his older brothers, Michael and Lucifer, turned on each other and began fighting one another, he couldn't bear it, retreating to Earth as an escape. Gabriel loved both his father and brothers, but he was unable to choose sides between Michael and Lucifer, so he left Heaven and "skipped out" to Earth.
He describes his experience at obtaining a vessel as having a "face transplant." After that, he went under "witness protection" and he began posing as a trickster, a Pagan god named Loki. Gabriel made quite a name for himself among other Pagan deities and was in fact known as the famous Norse god, Loki. As Loki, he killed people across the world that he deemed to be douchebags, though some he spared to spread the word, and eventually encountered Sam and Dean who foiled his plans on more than one occasion and discovered his true identity. Once Gabriel was exposed, he eventually aided Sam and Dean in stopping the Apocalypse by telling them the secret of the Cage door, but along the way was "killed" by Lucifer. Though he reveals himself before Castiel in the plan to stop Metatron, it is unclear as to whether it is really him.
Power and Stats
Tier: At least 3-B, possibly 3-A
Name: Gabriel, Loki, The Trickster
Age: Billions of Years Old (Older than the Universe)
Powers and Abilities: Superhuman Physical Characteristics, Non-Corporeal, Immortality (Types 1, 3 and 4), Reality Warping, Regeneration (High), Matter Manipulation (Sub-Atomic level), Telekinesis, Telepathy, Teleportation, Pyrokinesis, Cryokinesis, Photokinesis, Smiting, Astral Projection / Dream Walking, Invisibility, Supernatural Senses, Healing / Resurrection, Soul Manipulation, Time Manipulation, Spatial Manipulation, Life and Death Manipulation, Weather Manipulation, Energy Manipulation, Time Stop, Immunity to Soul Manipulation as he lacks one, Immunity to Time Manipulation, Acausality, Power Removal (for lower/younger beings), Sleep Manipulation, Mind Manipulation, Higher Senses (Angels can see things normally invisible to humans as well as the true nature of a being), Voice Mimicry, BFR (sent Sam and Dean to T.V Land), Can physically grab incorporeal beings
Attack Potency: At least Multy-Galaxy level, possibly Universe level (Created TV Land, which was stated to be a parallel universe and to house the realities of over three hundred TV shows. Should be somewhat comparable to both Michael and Lucifer)
Lifting Strength: At least Class 5
Striking Strength: Unknown. At least Building Class (Somewhat comparable to Lucifer, who can overpower humans, Demons, Pagans and Angels with no effort)
Durability: At least Multy-Galaxy level, possibly Universe level
Range: At least Low Multiversal (Extends across timelines and he can teleport almost anywhere including separate dimensions)
Intelligence: Very high. Possesses extensive knowledge as a result of being one of the oldest beings in existence. More knowledgeable about humans, magic and the occult than any other Archangel having been aware of how to open his older brother's Cage. Lived on Earth for Thousands of Years as "The Trickster". He has faked his death numerous times and assumed many identities, and was speculated to be one of the most cunning beings in Supernatural.
Weaknesses: Holy Oil (to an extent), Archangel Blade, needs a vessel