Gavriel is one of the six elite warriors of Maeve, Queen of Fae. He is known as the Lion of Doranelle and is first seen in Heir of Fire when he looks for Rowan in Mistward and then helps to defend the fortress from the Valg.
Gavriel is a tall broad shouldered male, well-muscled yet lithe, with tan skin and a feline appearance. He is mentioned having a kind, content looking face of lovely features with tawny-golden eyes and golden hair. Gavriel is heavily tattooed with a band of tattoos encircling his muscled neck and tattoos in the Old Language interrupted by scars cover the left side of his torso, his heart and rib cage down to his hip bone of the names of the men he commanded and had lost in battle.
He is Fae, and as such has elongated canines, pointy ears, and the magic to shift; his animal form is a massive golden-brown mountain lion with the same tawny eyes.
In Empire of Storms, he is mentioned as wearing pale clothing of layered, efficient fabric, fit for battlefields.
Not much is known of Gavriel’s personality except that he cares deeply, he cares for Rowan his oldest friend and cares for the men he leads so much so that he has the names of his fallen men inked onto his skin. He shows some compassion towards Aelin, as he is the only member of the cadre (excluding Rowan) who stops to see if she needs help during the siege on Mistward.
Gavriel also cares for those around him as shown in Empire of Storms. He never wanted to leave Aedion’s mother, he loved her greatly but he knew that if Maeve discovered it she would use the love to her advantage. After discovering that he had a son, Gavriel did everything he possibly could to have Aedion accept him as a father, and even if Aedion wouldn’t accept him he still used his magic to protect Aedion and Lysandra during the battle against Maeve's armada.
Being blood sworn to Maeve, he is loyal to her above all others but he cares for his friends and along with Fenrys did what he could to avoid the command of the oath to spare Lorcan and help Aelin and Rowan.
Throne of Glass
Before the series
Gavriel before the series is mentioned to have (like the rest of the cadre) travelled around the world under Maeves command and at some point he met Aedion's mother (Evalin's cousin and Aelin's aunt) and fell madly in love but she did not want him to stay so per her request he left and never came back unknown to Gavriel during their time together she had become pregnant with Aedion.
Heir of Fire
Gavriel first appears at night time while it is raining, in his mountain cat form. Rowan goes to meet him and it is revealed that Gavriel is grieving for his fallen men. So they both go to Rowan's room to have the names of his fallen men inked onto his flesh. Aelin, however, interrupts the moment with food, claiming that Rowan forgot to eat. She catches Gavriel in a moment of weakness as he is sprawled out on top of Rowan's table with ink. She then later leaves after Rowan yells at her, but before she goes, Gavriel sniffs the air, smelling her scent and most likely recognizing her bloodline.
After the encounter in Mistward, he is not seen again until the Valg Princes invade Mistward. Having been summoned by Rowan himself. He appears in his Mountain Lion form again and is running towards Mistward with Rowan's other five cadre, all having been summoned by him. As they pass, Aelin—who is fighting the princes with everything she's got, makes a bridge of fire to the Wardstones in order to get in. The others don't spare her another glance and rush in, but Gavriel stops and stares at her, considering whether to continue on or stay and help her fight. Aelin claims that Rowan and the other demi-Fae needs his help more, so he reluctantly continues on.
He finds Rowan and helps him to keep the invaders back but Rowan finds out at that Aelin is not in good condition, and rushes out to help her. Gavriel—not wanting his friend to die—chases after him and tackles him to the ground, stating that it is a lost cause to try and help Aelin now. As she is currently being devoured by the princes and trapped. However, Rowan is not deterred and continued to struggle against Gavriel who holds the mighty warrior down with his strength, and protecting magic to shield him from Rowan's wind and ice.
Later on, as it is revealed that Aelin is going to make it, Rowan breaks free from Gavriel—who is in shock at seeing Aelin's burst of fire and watches as Rowan gives Aelin his magic to borrow and defeat the princes' once and for all. With the battle won, all the others leave without another word, but Gavriel stays behind to say goodbye to Rowan and Aelin. He is puzzled and asks how old Aelin is, to which she replies that she is nineteen. He is then relieved, most likely because she couldn't have possibly been one of his former lovers, as she bares striking resemblance to Aedion's mother, as it is revealed in Queen of Shadows. He then departs with the others.
As Aelin and Rowan arrive in Doranelle, all six of the cadre—minus Rowan—are there. After brief talking, Gavriel comes forth with a whip and starts to beat Rowan, under command by Maeve to do so. He had no facial expression, having been through this before, so it is not known if he hates doing it to his friend. After the Doranelle encounter, he wasn't seen again.
Queen of Shadows
Gavriel makes no physical appearance in Queen of Shadows but is often mentioned. Upon meeting Aedion, Rowan realizes that Gavriel is Aedion's father and apparently left Aedion's mother under Maeve's command. This is theory for why Gavriel asked Aelin how old she is, for the striking resemblance she bares of Aedion's mother. However, Gavriel has no such knowledge of having a son.
Empire of Storms
Gavriel joins Aelin and Rowan on Skull's Bay. He and Fenrys are there to warn Rolfe of Maeve's armada. The two cadre members are on a mission to kill Lorcan. Rowan asks them to assist him and Aelin with the war against the Valg King. They agree, saying Maeve never said a specific time when ordering them with the blood oath. Later on Skull's Bay, Gavriel meets his son, Aedion. Aedion is angered and confused, yet Gavriel never stops trying to earn his son's approval. Gavriel helps in many battles and even refrains from killing Lorcan to help. During the altercation on the beach with Maeve he offers to take whatever punishment was meant for Aelin (this is because he known how much Aelin means to Aedion and if he lost her again it would break him). He later pays for this when Maeve breaks the blood oath and marks him dishonorable forever. This way of breaking the blood oath seems to be not favorable as both Gavriel and Lorcan were devastated. They seemed to be marked as cowards and unworthy. At the end of the book Gavriel volunteers (with Lorcan and Elide) to help Rowan track down his lost mate and get her back from Maeve.
Magic - Gavriel appears to use some kind of protection and healing magic, capable of keeping Rowan from harming him as he held him down; as well as healing Elide after she was bitten by Fenrys and covering Aedion and Lysandra in a second skin of golden magic that protected them during the battle against Maeve's armada.
Shape Shifting - His animal form is a massive golden brown mountain lion.
Fighting Skills - Gavriel is mentioned by many people in the series to be an amazing fighter and shows great skill at tactics and military planning. As a child Aedion was told stories of the Lion of Doranelle a white knight of legend.
Blood Oath - Gavriel is sworn under Maeve and is her loyal pawn to do whatever it is she sees fit and he cannot object.
Rowan used to be one of Queen Maeve's cadre, but is now in Adarlan with Celaena. Their relationship shows that they greatly trust one another, as when Rowan offered to tattoo Gavriel for him. Though Rowan would never admit it out loud, their bond is that of trust worthy comrades, and Gavriel would do anything to keep his friend safe. As such, when Rowan called for him to help, he came right away.
Gavriel recently met his son, Aedion. He loves his son and feels horrible for leaving him and his mother. Gavriel was forced to leave. He also constantly struggles for Aedion's approval and acceptance.
His relationship towards Aelin is that of kindness, as such when he tried to help her and no one else would. It is also said that Aelin looks identically to one of Gavriel's former lovers. He is nice to her and is the only one who offered to say goodbye after the rest of the cadre left. He also risked everything to help her and Rowan.
It is not known if Gavriel even cares for Queen Maeve, but she is his queen and he is blood sworn under her control to do whatever bidding it is that she sees fit.