Still, I didn't want to just copy, so I worked out an own idea. Making Ranma the older sister of Serenity called Tranquility, cause well, would be the same naming scheme. Tranquility would have been born right about the founding of the Silver Millennium I think and would have been the Heir apparent for the longest time, though unlike her sister and mother, she would be a bit a lot martial orientated and have been instrumental in securing and expanding the Empires borders outwards. I was thinking of going with the idea that this Empire would eventually span the entire Galaxy, well most of it before it's collapse once the center got destroyed and the edges started warring internally after the death of Queen Serenity. And the entire fall would have been precipitated by the death of Tranquility herself decades earlier, leaving the empire run by perhaps slightly to peace loving rulers.
In any case, Tranquility died defending Earth and the Moon at Jusenkyo and got sealed away there and died, eventually leading to the creation of the Jusenkyo pools. Her mother at the end of the empire manages to send her forward along with everyone else 60.000 years ago (I figured this was a nice date, as around that time in our time line humanity almost went extinct) How ever due to Tranquilities unusual way of death via a sealing, she's reborn as Ranma and end up male. He is still partially linked to the pools though, thus leading him to be attracted to it and eventually thus cursed/forced awakened to her old form. Which Leaves Ranma stuck as a girl and in this case, with no way back. Well unless 'she' can figure out her own magic to actually cast a gender changing spell, but this has a hook, because the best way to learn magic is to use her memories. And him being manly, he obviously is not interested in becoming more of a girl.
I'm still working on how to fully integrate the time lines from them on, though I'm thinking of a more technological explanation to everything, like for instance Ozzallos tends to prefer as well. With perhaps star seeds being some kind of magical device, perhaps some thing a bit like linker cores in the Magical Girl Nanoha series and similarly a kind of magic technology, allowing them to have some spacecraft etc etc in the past. Metallia would be then I think a weapons system from an old enemy that was willing to do anything to not be absorbed by the empire, Chaos would I suppose be something similar but maybe even worse?
I'm still busy figuring out how to make all aspects of the story a bit more technological, I guess the time gates aren't to much of an issue in this respect, just treat them like a black box. I'm tentatively thinking perhaps the dream mirrors could be considered as a way to viewing in to a persons mind via their star seed interface then. Youma could either be some thing like I guess transformed humans or a magical construct, Cardians I guess are a magical construct. Guinzuisho is maybe a device that allows you to vastly surpass your natural limits even up to ridiculous extents, but obviously how further you exceed it, the more chance you will lose control and burn out and die.
Also to avoid some problematic plot problems etc, I think I probably should cross some of the manga plot elements with the anime plot elements. For instance the presence of humans everywhere seems most easily explained by Earth once long ago being the original world that colonized everything and thus avoiding the Galaxy Cauldron problem of being the source of everything, that gives me continuity headaches. Though on the flip side, Galaxia's minions probably going right after the Senshi as soon as they can find them, knowing full well which kind of person has star seeds. Though honestly I'm not sure how to deal with time problem around Nehelenia and the extra year they seemingly had there to prepare for High School, maybe I should just ignore it and move them on or so...
