Tough one.....I guess I'll go with Darkseid, he doesn't seem like a person who cares about his surroundings as long as he's free to his devices. Thanos, on the ther hand, is VERY antisocial.
Don't worry about him PenWing, wordsw are words. But I know that means nothing here, so...GIVE HIM HELL!!
Ra's gets fed up with trying to make Bruce his heir and decides to get an heir that couldn't possibly be defective like Batman's. So he has a kid with Talia.
or
Shiva decides to actually seduce Batman instead of keep on the sidelines(seriously, why doesn't anyone consider her a love interest.) The Sex is so good that Bruce goes into a coma where he thinks he survived a car crash and is being stalked by Shiva.