I've got a few new ideas. Including one of those that should never pop up.
An astronomic idea wrote:
One day Mamoru is looking through his father's papers and finds out his mother is still alive, and he may well have a sibling: his father had divorced and remarried, and his mother was apparently pregnant when that happened. To try and find her he asks his other relatives, who aren't much of help except for a small hint that allows him to track her down. When he gets the address he finds it familiar, but dismisses it and goes to meet his mother... And before he can ring the bell he discovers he does indeed have a sibling. A younger sister, to be precise, who has known she had a brother for years and had suspected it was him for astronomical reasons before dismissing it as stupid. But who is the sister? This girl.
And Chibiusa knew the whole time but never said anything because she just assumed they knew too (Kind Endymion was too embarrassed by his reaction when he found out, and her aunt forgot there had been any problem at all)...
A reason for fighting wrote:
As you may remember from Codename: Sailor V, at first Minako didn't want to fight. Then why did she do it? She had an agreement with Boss: Boss would cure her younger sister, terminally ill from lung cancer, and Minako would fight during the cure. Minako had actually offered to fight forever, but Boss lowered her time under the arms...
Read this one at your own risk and peril.
In this one the first thing Minako does after coming back from Beijing is visiting her cousin to help him in his relationship with his fiancee and deal with a few things that have been nagging her for years, chief among those the circumstances of his cousin breaking up with his first girlfriend and the lack of respect he's been having for years. Problem is... The cousin is Ataru Moroboshi. THAT Ataru Moroboshi. And Lum's actually an unawaken Sailor Senshi.