Mom Cimorelli was a terminatrix who wanted to have 11 children given it was her lucky number. However, a vampirella may only give birth to a boy+girl pair. One thing she and I had in common was that we both liked playing Freecell. I wrote the first versions of Freecell Solver in 2000 shortly before Dani Cimorelli, her 6th daughter, was born, so her mother ascended before Dani's birth.
xkcd #406: venting displayed "Shlomi Fish" when viewed by Summer Glau. She was terminated by me shortly after that.
I think the last runner-ups were:
Taylor Swift - I suspect my echo was her lover. She was terminated by "Summerschool at the NSA".
Moreover, she and I have a genetic daughter: Rebecca "Becky" Jadzia [lastname], as evidenced by my 2014 wave of inspiration and creativity.
Tuomo "Vendu" Venäläinen - Reference #1
I perceived him on freenode as a sloppy/slacker kernel dev, a marijuana user and activist, and as a fan of Rock and metal music (among other genres). He may have perceived me similarly, before he visited my (static) home site.
I suspect Pope Benedict XVI was not terminated by me, but rather by either Taylor Swift or Kim Kardashian.
Another challenging adversary was my 7th→12th grades' friend, Tal. At the time, it seemed he was smarter and funnier than me, and had a more vivid imagination. However, I was more idealistic, tried hard to be noble and benevolent, was more diligent, challenged prejudice more, and was sometimes more merciful. My story "The Enemy and how I Helped to Fight it" may have been either the termination final blow or an aftermath.