Jace is chivalrous, quite flirty, charisma, good looks, and charm. hes taught that "to love is to destroy, and to be loved is to be destroyed." at early age. He kept everyone, except Izzy and Alec Lightwood at arms length. Jace has sharp, defensive wit, acidic temperament, very sarcastic attitude to hide his insecurities. Jace is extremely arrogant, self-centered, overconfident, vindictive, he is cruel to protect those he loves, strong, fast, and skilled with every kind of weapon. Shadowhunter.