Saiouji Yukako

The school nurse, granddaughter of the school's first School President. Busty and good-willed with everyone around her.

In Shiritsu Onsen Gakuen, she strongly opposes the current Student President's decision of having all girls wear swimsuits in the school's bathhouses, as it ruins the school's tradition. To prevent this, she coerces the protagonist (a young teacher) into "persuading" girls to help her overturn the decision under the threat of getting him fired.