Granart Needakitta is a princess of Needakitta, the nomadic Fire Kingdom inhabited by the cat-people, and is the designated keeper of the powerful Ring of Fire. Her nation is uniquely mobile, having lost its original land in a past conflict, and now travels across the world on massive moving platforms, often operating as a band of mercenaries. As a cat-person, she possesses animalistic traits and is known for her bronze skin and distinctive cat ears.

Personality-wise, Granart is initially defined by her pride and fierce warrior spirit. She is exceptionally strong and holds a meritocratic worldview, believing that strength is the most important quality. This outlook has made her weary and frustrated, as she has grown tired of her unparalleled strength within her nation. Despite her tough exterior, she is not without a sense of duty and honor. However, after accepting Satou as her husband, her personality undergoes a dramatic and sudden transformation. The shy or reserved side of her vanishes, replaced by an intensely affectionate and what is often described as a carnivorous demeanor. She becomes remarkably proactive in pursuing a romantic and physical relationship with Satou, showing little shyness about her desires.

Granarts core motivation stems from the laws of her people. Among the cat-people, a powerful warrior princess is bound by law to marry any man who can defeat her in combat. To find such a man, she holds daily matchmaking duels, but no challenger from her own land or elsewhere has ever been able to best her. This situation leaves her feeling past her prime by her nation's standards, and she eventually seeks any worthy husband to fulfill her role. Her interest in Satou initially is pragmatic, seeing him as a potential way to end her endless search, but her feelings deepen into genuine love as she witnesses his sincere and determined heart.

In the story, Granart serves as a major ally and a romantic partner for the protagonist, Satou. She resides in her mobile kingdom where Satou journeys to retrieve the Fire Ring. She is initially skeptical of Satou, viewing him as weak and unskilled. She even offers to throw their duel so she can fulfill her duty and give him the ring, but his earnest refusal to accept a hollow victory impresses her. During their decisive rematch, Satou is able to miraculously predict her movements and claim victory, an event she chooses to accept as a miracle born from his strong will. After an attack by a servant of the Abyss King interrupts the duel, she officially recognizes Satou as her husband and joins his quest, wielding her power as a member of his party.

Her key relationships are centered on Satou and her fellow ring princesses. With Satou, she transitions from skeptical challenger to a fiercely devoted and forward wife. She often attempts to get Satou, who is from modern Japan, to adapt to the more direct common sense of her world regarding relationships. She shares a friendly but competitive dynamic with the other princesses, particularly Hime, who act as her romantic rivals for Satous affection. They have even worked together to humorously thwart Granart's most aggressive advances on him.

Throughout the narrative, Granart develops from a weary, proud warrior who feels trapped by her own strength into a passionate and devoted partner. Her initial desire to find a strong husband to produce equally strong offspring transforms as she develops real, heartfelt love for Satou. She remains one of the most proactive and enthusiastic members of the group, both in battle and in the ongoing romantic battles over the protagonist. Her notable abilities are immense, derived from her natural cat-person physiology and her ownership of the Ring of Fire. She is considered the strongest and most valiant fighter in her entire nation, possessing overwhelming combat power that no man from her homeland has ever matched.