Before he was a vampire, Zelman was this poor peasant farmer who lived in Poland and who was amazingly happy with himself and his family and his flock of sheep. Haha. He was also going to get married!! Until Asura made him into a vampire.
Asuka actually had a good girl!friend (friend that is a girl of course), back in college, who unfortunately turned out to be a complete ass who used her for her homework and stuff. >8( And made fun of her until Asuka smacked her in the face and got into a GIRL!FIGHT!. She didn't get suspended because of her Evangelion pilot status, so the other girl got suspended instead neener neener neener. 8DDD
Himawari's grandmother used to own a koi pond. She let Himawari take care of the fish only to come home one day to see that all of them were DEAD which prompted Grandmama to go to that shrine and get Himawari checked out and stuff.
Link's childhood friends are Madarao and Tevak. Because it's cute. :) And they had a falling out when Link decided to leave CROW or something (until Hoshino tells us more about Link's past)