The official premise
New Tales introduces One as a young Legend on a quest to discover her past and secure her future. Steam also places her in a mission to save a dying desertscape from Paradox corruption.
Keep later detail out of the premise
This is a starting-context article. It does not infer unannounced relationships, later plot turns or character motivations beyond the official description.
Sources
Q: Who is One?
Official material describes One as a young Legend and the game’s protagonist.