User blog comment:DYBAD/Character Sheet/@comment-24441215-20141009071359/@comment-4867780-20141009074637

Nine human beings enhanced via cyber-genetics where design to rule the world after it was sufficiently restored (an entinction-level almost wiped-out humanity). These nine enhanced humans were the children of a genius woman with Scientific Prowess and Tactical Analysis who planned the whole thing 600-700 years ago, and almost nothing when wrong except her plan for genetic reincarnation failed (though even that was within her predications, has she left an holo-message explaining everything to her children once the other piece have fallen into place.

What does all that have to do with "Seira" ? Well, she was the first child of this genius mad scientist, born centuries before the others. She served as prototype for them, and stayed active when the others where put into stasis waiting for the time to come. She watched over them during their cryo-sleep, and guided them once awoken on the predicted path afterwards. All that is the reason why they call her "Mother", while she's technically their half-sister (each children has a different father, probably for genetic diversity.