Alexander "Alec" Gideon Lightwood is a Shadowhunter living in the New York Institute with his siblings. He is the oldest of the Lightwoods and is quieter than both Isabelle, his brother Max, and Jace, his best friend and adoptive brother. Alec is 18, making him legally an 'adult,' which gives him permission to attend Clave meetings. Alec denies his homouality and attraction to males (particularly Jace), which results in him lashing out at people. When he finally accepts himself, he becomes a more relaxed person and comes out as gay to the whole Clave and everyone there, including his family and parents, by publicly passionately kissing Magnus. 

Alec is mostly soft spoken and serious. He tries his best to act wisely, and is not as reckless as Jace. Alec is said to have a thin, wiry build and like his mother, has black hair, luminous blue eyes, and impressive height. He is also very pale. Alec is described as being very handsome as well, but unlike his sister, he tries to downplay his looks by wearing worn out sweaters and damaged clothing. (Kevin Zegers)