!!! i have a few thoughts! valerian is very 🥺 about monsters (does a banshee count as a monster? i feel like they're often portrayed that way but aren't necessarily monsters idk ANYWAY) so i was thinking he ran across her... roughly 8 or 9 years ago on some kind of adventure he undertook??? potentially she kinda foretold of a death of someone close to him and he just. stubbornly befriended her and confides in her?