Jose is the sole daughter of the village lord of Rag, which establishes her as a member of a prominent family within her community. She is an albino, a trait that gives her white hair, red eyes, and pale skin; this striking appearance has earned her the nickname the White Princess. Her physical description consistently notes her white hair styled in twintails, and she is perceived to be a teenager.

In terms of personality, Jose is presented as a complex individual with a strong internal drive. She is described as cool-headed, intelligent, and one who rarely displays her emotions openly. Despite this reserved exterior, she is known to care deeply about her allies. Her primary motivation is a sincere desire to become stronger. She wishes to fight and contribute meaningfully to the protection and well-being of her village. However, this ambition places her in direct conflict with her family. Her father and brother forbid her from participating in dangerous activities, insisting that she does not need to fight and is better off as a sheltered or spoiled daughter.

Frustrated by these restrictions, Jose takes matters into her own hands by secretly training on her own whenever she can find an unguarded moment. During one of these clandestine training sessions, she makes a crucial discovery: she learns that Kai can use magic. Rather than exposing his secret, she strikes a bargain with him, forcing him to keep her own secret and become her training partner with the spear in exchange for her silence. This event marks a significant shift in her role, as she and Kai begin to train together. In their dynamic, Jose acts as an older sister figure to Kai, often guiding and advising him. Her skill as a warrior is noted, coupled with a tactical insight that makes her an elegant and effective presence in battle.

Her role in the story is further elevated by a unique supernatural quality. Jose is a bearer of a blessing, which means she houses the power of the earth god, or valley god, within her own body. This divine blessing connects her to the central conflicts of the world. Her development in the narrative includes experiencing the consequences of these conflicts firsthand. She suffers a leg injury and loses consciousness after a curse, which is inscribed into a tombstone, begins affecting her village and its inhabitants. This event directly ties her personal well-being to the larger magical and political struggles of the setting, showcasing her vulnerability and cementing her role as a character whose fate is intertwined with the central plot.