Petra Mille Hubarek is a supporting character in the anime Sweet Reincarnation. She is the third daughter of the Hubarek frontier family and the twin sister of Licorice Mille Hubarek, placing her within one of the region's notable noble households. She is a teenager with long purple hair and pink eyes.

Her personality is defined by a warm and outgoing nature. She is cheerful, sociable, and talkative, yet she is more mature than she appears and carries herself with dignity, especially in public settings. This combination of liveliness and composure allows her to move easily between casual conversation and more formal occasions.

Petra's most significant relationship is with her twin sister Licorice. The two are very close and frequently work together, and Petra's role in the story is largely connected to that partnership. Within the wider events of the anime, she serves as a supportive figure whose steady presence and sense of decorum complement those around her. Her behavior reflects a sense of responsibility expected of someone in her family position, and she carries out her duties with reliability and grace.