Elektra Natchios (Earth-1638)

"I'll be direct. There have been many women in Matt'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, Felicia. 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 Natchios to Catwoman

Elektra Natchios is one of the world's greatest assassins, and a high-ranking member of the League of Shadows, being the daughter of Ra's al Ghul himself - although he insists their heritage has nothing to do with her position, which she gladly proved. Posing as a student on the Gotham University, Elektra fell in love with a young Matt Murdock, and the two started a relationship. While it ended abruptly, so never did their love and passion.