<P> Jace Ligtwood - Herondale is a Shadowhunter living at the New York Institute with his adopted family . Jace's legal name changes throughout the series, from Jace Wayland (when his father is thought to be Michael Wayland), to Jonathan Morgenstern (Valentine's son), to Jace Lightwood for the family that has taken him in, to Jace Herondale (when his true father is revealed to be Stephen Herondale). His mother was the young Celiné Herondale, a member of Valentine's inner circle with Stephen Herondale, his father . </P> <P> The nickname "Jace" was given to him by Maryse Lightwood after his (fake) initials J.C. (Jonathan Christopher, because no one but Valentine and Jocelyn knew Jace was not his real son), when he first began living with Maryse Lightwood and her family, because of his dislike for his name . Jace was given the blood of an angel named Ithuriel by Valentine when Celiné was pregnant with him . This gave him enhanced abilities, even compared to regular Shadowhunters (Shadowhunters hunt demons that come into this world through portals from their own worlds), such as the ability to jump from extreme heights and survive, run faster than any other Shadowhunter, and move with a stealth close to that of the Silent Brothers . </P> <P> For most of the books, Jace's sarcastic, cold remarks and behavior hide his tortured and angry soul . In City of Ashes, his strong "bad - boy" personality makes Maryse Lightwood (his adopted mother) somewhat scared of him, worried that he is too much like Valentine, who was believed to be his real father until the assumption was proven false in City of Glass . Jace and Clary fall in love in City of Bones, making Clary the only girl Jace has developed real genuine feelings for, but after they find out they are "siblings", each attempts to get over the other by dating other people . He is naturally overprotective and caring for her, although Clary does not see this due to her internal suffering . At the end of the third novel, City of Glass, Jocelyn contradicts Valentine's avowal that Jace and Clary are siblings, telling Clary that Jace is actually the son of Celine and Stephen Herondale . The truth frees Jace and Clary from the torture of having seemingly incestuous feelings for each other, allowing them to accept their mutual feelings and become a "real" couple . </P> <Dl> <Dt> Physical appearance </Dt> </Dl>

Who does clary end up with in mortal instruments