Altezza serves as princess of the Jewelry Kingdom and younger sister to Prince Bright. Her initial selfish tendencies surface when she falsely accuses Seed Kingdom princesses of stealing her necklace. This outward demeanor masks a genuinely kind nature she struggles to express, exemplified early on when she desires to apologize after accidentally injuring Fine yet cannot voice it. Gradually, she opens up to Fine and Rein, ultimately aiding their mission to save her antagonistic brother.

Her appearance features long blonde hair often styled in large, fluffy pigtails or ponytails and round green eyes. She primarily wears a signature sleeveless princess outfit: a white and green striped dress paired with an orange cape, black pants, and orange shoes, accessorized with diamond hair ornaments and a black choker bearing a diamond pendant. Traveling with Fine and Rein prompts a shift to casual attire including an orange and white shirt and long black socks.

Altezza excels in various activities, particularly dancing, though she demonstrates notable difficulty with artistic pursuits. She holds a strong affinity for jewelry. As relationships deepen, she develops romantic feelings for Auler, prince of the Windmill Kingdom. Her personality evolves from tsundere-like behavior toward greater emotional openness. By the second season, she reveals a humorous side, forming a comedy performance group with Princess Sophie and Princess Lemon.

Key developments include moments of vulnerability and determination. During a critical confrontation, she admonishes Fine and Rein for their recklessness while simultaneously acknowledging their kindness. She wins a dance competition at a Princess Party, showcasing her dedication. The manga adaptation presents a substantially different portrayal: appearing more infrequently with a shyer, less selfish personality and playing a markedly reduced role.