TV-Series
Description
The character identified solely as "Former Rosa Gigantea" held the position of White Rose on Lillian Girls' Academy's Yamayuri Council before Sei Satō. Official media provides no personal name, leaving her background largely undefined. She chose Sei as her petite sœur, initially citing Sei's appearance as the reason but later admitting this was a pretext to shield Sei from undue expectations. This established a consistent approach where she deliberately minimized emotional demands on her petite sœur.

Her mentorship focused on fostering autonomy and inner strength. She advised Sei against becoming excessively absorbed in cherished bonds and instructed her to repay kindness by aiding future generations, not through direct reciprocity. This specific guidance directly shaped Sei's own mentorship of Shimako later. Their relationship displayed complexity, marked by limited overt communication that suggested detachment. However, this dynamic originated from their perceived similarities, not distance, with both prioritizing each other's wellbeing while maintaining independence. The White Rose family tradition of reserved support and mutual understanding continued through subsequent generations.

Personality assessments describe her as embodying traits associated with both INFJ and ENTP types, reflecting a blend of intuitive insight and principled idealism. Enneagram analysis suggests Type 1 tendencies, indicating a strong moral compass, perfectionism, and internal self-criticism. Her leadership combined stoic composure with deep loyalty, expressed through actions rather than declarations. She demonstrated particular skill in tea ceremony and maintained unwavering commitment to her responsibilities, including firmly rejecting Sei's attempt to dissolve their sœur bond before graduation.

Her legacy endured beyond her graduation through Sei's adoption of her mentorship principles. The recurring themes of restrained support, encouragement of autonomy, and paying kindness forward became defining characteristics of the White Rose lineage, directly influencing Shimako's later leadership approach.