Griselda Reginhard (グリゼルダ・レギンハルト), mostly referred by her nickname Zelda (ゼルダ), is the personal bodyguard of Princess Rotte. One of the strongest warriors of the kingdom, despite her human appearance, her actual race is unknown and is never disclosed in both the manga and the anime. Almost at the end of the manga it is strongly implied that instead of being a Maður she is in fact a Valkyrja.
Zelda is a young woman of a slim body frame and small stature. She normally uses a dress uniform color black, with small differences in color in the manga and anime versions. While she has long hair, it's always combed in a high ponytail with bangs. Her skin is white with golden colored eyes. In the anime her hair color is closer to brown, but in the manga it's dark pink. She looks like a normal human.
Her exact origins are unknown and are never explained in the story. She is not a human, but also not one of the many races known in Álfheimr. She was raised since her childhood by her foster parent and fencing mentor, Atli. Due to this she has a very huge crush on him to the point that she never notices that he is gay.
When she was 13 years old, she first met Rotte, who was 6 years old at the time, and they clashed a little. Rotte didn't at first notice that Zelda was a girl. At the time, Judit visited Atli to try to convince him to become Rotte's bodyguard, but after an incident in which Zelda protected Rotte from a wild dog and Rotte praised her, Zelda proclaimed that she would become the princess' personal bodyguard which she did a few years later.
In chapter 64 of the manga, it is revealed that she is the very best combatant in Yvgarland's army, likely due to her being the foster daughter of Atli, but also because of her heritage, as it is heavily hinted that she is a descendant of the Valkyrja.
Her underwear varies, but she regularly wears a fundoshi like she used to when she lived in her hometown.
Zelda was always a tomboy and mostly keeps this trait, except when she is around Atli, around whom she tries to act as feminine as possible. Since Atli raised her and taught her swordsmanship, she has a very huge crush on him to the point that she never notices that he is gay and has the hots for Naoya. She has a complex with her small breasts.
She doesn't appear to be attracted to Naoya, but when given the chance she welcomes the opportunity to test her skill against his, losing in the occasions that this occurred due to unforeseen circumstances not related to their performance.