|Full name:||Gideon Arthur Lightwood|
|Family:|| Sophie Collins (wife)|
Barbara Lightwood (daughter)
Eugenia Lightwood (daughter)
Thomas Lightwood (son)
Benedict Lightwood (father)
Barbara Pangborn (mother)
Gabriel Lightwood (brother)
Tatiana Lightwood (sister)
|Hair color:||Sandy blond|
Gideon Arthur Lightwood was born the eldest of three children, the others being Gabriel Lightwood and Tatiana Lightwood. Their mother died when he was five years old, and the story of her death that their father told them never made sense to him. Raised by their father, Gideon and his siblings grew up believing all Shadowhunters were like Benedict, who flouts convention and the Law, and they all acted like it. Gideon, however, had apparently never been happy in London, calling their home a miserable place ever since his mother's death.
Gideon was about fourteen when he met Will Herondale at a Christmas party held at the London Institute. His sister, Tatiana, was hopelessly infatuated with Will. When Will humiliated her by reading her diary in front of the entire Enclave, Gideon and Gabriel developed a deep loathing for Will.
When he completed his Shadowhunter training at eighteen, Gideon opted to travel to another Institute and settled in Madrid. Gabriel was shocked to realize that all Shadowhunters weren't as pompous as his father and was apparently treated like a monster until he realized the wrongness of the principles he was brought up with and changed his ways.
The Infernal Devices
Around a year after he left to travel, Gideon was called back from Madrid by his father. He was told that he was needed at home, and that he must return immediately. Therefore, despite his wish to stay away, he embarked on the journey home. He only did so in hopes of helping his brother, Gabriel.
He and Sophie began to meet when Sophie wasn't working. Sophie began to greatly love him, and he her. When the Shadowhunters of the London Institute needed someone to watch the Institute while they were out, Sophie recommended Gideon. He then became the one that they often called when needing someone to watch the Institute.
Gideon attended a party that his father held. He was disgusted to discover that his father was fratenizing with demons, an act which is illegal in Shadowhunter culture.
When the members of the Institute came to blackmail his father, Gideon sided with them in the confrontation. He feared the future of the Enclave, the London Shadowhunter force, if his father became head of the Institute. Then, he left with the Institute Shadowhunters, deciding to take up residence at the Institute.
He sat with the Institute Shadowhunters at the Counil meeting.
He is still in love with Sophie, and thus hid the scones that Sophie had to carry around, under his bed, this makes Sophie angry because he was making her overwork. However, Gideon later proposes marriage to Sophie, and she agrees.
In Cadair Idris, he fought alongside Gabriel, and returned alive.
He is said to have died a few years before Will in the Epilogue of the book.
Gideon is described as very attractive. He was very muscular and had thick, sandy-blond hair. He also had a similar face as his brother, and they shared the same lumious green eyes.
Gideon is exceptionally different from the rest of his family. He is quiet in nature, mature, and kind-hearted. He is known to be a fairly good teacher to Sophie and he is far less rash than his brother. He is shown to care very deeply for his brother, returning to London, though he hated his father's home, just to help his brother.