|First Appearance||Legend of the Golden Witch|
|Portrayed By||Ami Koshimizu|
"No, I'm not even allowed that, I'm not even allowed a night to myself to drown my sorrows!! Who are you?! Who?! You ruined my life, and won't even let me have a new one...Just what are you to my life?!"—Rosa Ushiromiya, Alliance of the Golden Witch
Rosa Ushiromiya ((右代宮 楼座 Ushiromiya Rōza?) is Kinzo Ushiromiya's fourth and youngest child. Since she is the yougnest of Kinzo's children, she isn't well-respected by the rest of the Ushiromiya family and rarely speaks up at family meetings. She is a single mother to Maria Ushiromiya.
Shortly after moving to the island of Rokkenjima, Rosa met Beatrice Ushiromiya, Kinzo's hidden child. In an effort to help Beatrice escape her imprisonment in the Kuwadorian, Rosa attempted to lead her through the surrounding forest towards the Ushiromiya main building. On the way there, Beatrice slipped and fell from a cliff, dying instantly. Rosa feels lingering guilt for her involvement in the death, though she rarely mentions it.
Rosa runs a clothing brand named "Auntie Rosa".
Rosa appears as a fair skinned woman with medium-length brown hair with a hime cut. She is the least endowed of the Ushiromiya women. She wears a long, black, double-breasted gown combined with a red skirt and a white shirt. She has the One-Winged Eagle imprinted on her tie.
Rosa is prone to violent outbursts, especially in regards to her daughter. In particular, when Maria whines, Rosa is quick to hit her regardless of the time or place. Despite her abuse and generally neglectful disposition towards Maria, Rosa still very much loves her daughter.
Rosa is shown to be talented at handicrafts as she makes Maria's Sakutarou stuffed animal and later knits a scarf for him.