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Henrietta de Tristain, crown princess and later queen of the Kingdom of Tristain, is the daughter of King Henri de Tristain and Queen Marianne. Following her father's death, her mother stepped down to mourn, placing Henrietta on the throne. Her grandfather was Philippe III de Tristain. Her extended family includes cousins Wales Tudor of Albion and Tiffania Westwood. She shares a deep childhood bond with Louise de la Vallière, eventually formally adopting her as a sister.

Physically, Henrietta possesses short purple hair and teal blue eyes, standing 158 cm tall. She typically appears in regal attire: a purple cloak over a white silk dress with long sleeves, complemented by white stockings, high-heeled shoes, and a diadem or crown. Her magical affinity is Water, classified as a Triangle mage, though she rarely practices. She temporarily reached Hexagon-level power by combining magic with Prince Wales.

Prioritizing her nation's stability and subjects' welfare, Henrietta favors diplomacy over military action despite the pressures of rulership. The assassination of Prince Wales, her cousin and romantic interest, profoundly affected her. She vowed eternal love for him, even as his dying wish urged her to find happiness with another. This loss hardened her resolve to protect Tristain from Albion's subsequent invasion.

Her relationship with Saito Hiraga evolved from curiosity about his defiance of nobles like Count Mott into romantic interest. Disguised as Louise at the Slepnir ball, she confessed her feelings to Saito and kissed him, witnessed by Louise. Henrietta later apologized but suggested openness to polygamy, a common noble practice, though Saito reaffirmed his commitment to Louise. A magical mirror linking her chambers to Saito's mansion facilitated private conversations, including another kiss witnessed by Louise, causing temporary estrangement. Henrietta ultimately reconciled with Louise and supported her relationship with Saito.

As queen, Henrietta navigated complex alliances, notably sending Louise, Saito, and Tiffania to Romalia to confer with the Pope about emerging threats. She gave Tiffania Prince Wales's ring, recognizing her as Albion's rightful heir. During the Ancient Dragon crisis, Henrietta mobilized Tristain's fleet and allies, contributing to the creature's defeat. She later attended Saito and Louise's wedding.

Henrietta enjoys disguising herself and dancing to "Fairy's Lunch." Her favorite food is horn-sheep soup. She holds a childhood fight record with Louise of 29 wins, 24 losses, and 1 tie. Her name references historical figures, including Henrietta Anne Stuart of England.