Geolouise (little girl with pink hair at the beginning, ghostly figure seen by Geolun (crimson commander) when he destroyed the shield, and final boss of the bonus dungeon) is the protagonist of Kings Exit.
To simplify her impact in the timeline: she was the strongest mage in the human liberation army (well, the second one), leader of the human suicide squad, and creator of half of mankind invention in the fight against demons.
In King Exit, she ended up wiping out, with the help of her squad every remnant, and was responsible for the extinction of their species, though she regretted being forced to do it.
The ending is weird. I hated it at first, but now I think it's fine: it work with KE (with some modifications), and give allow characters to succeed in their missions.