Elektra Natchios (Earth-1356)

"I'll be direct. There have been many women in Bruce's life, but only two he has truly loved -- you and I. It is inevitable that his enemies will strike at him through us. They will do everything within their power to make us betray him. Therefore, I offer you a gift, Selina. The method of burying the knowledge of his dual identity so deeply that no coercion will force out the truth. For even with his eventual death, there are secrets of the Batman that must remain forever untold."

- - Elektra to Catwoman

Elektra Natchios was an assassin of the League of Shadows and daughter of it's leader, Ra's al Ghul, as well as sister of Nyssa Raatko. During a mission for the Hand, she fell in love with Bruce Wayne during his young years when she studied under the cover of Louise Badeaux at the Columbia University. Years later returned to Bruce's life, who she discovered was the vigilante Batman when her beliefs and methods conflicted with his philosophy. After multiple situations one against the other, Elektra chose to side with her father, but still holding love for Wayne. During the Arkham City event, Natchios met Bruce once more, and stood alongside him against the Joker, trying to save her lover from TITAN poisoning, but was killed by the real Joker, hiding in Monarch Theater, who revealed his other self was Clayface in disguise.