Yukina Shiratori

白鳥 ユキナ

Yukina is Tsukumo's younger sister, and is horrified to find out that her older brother has fallen in love with an earth woman (Minato). She promptly leaves for the Nadesico to assassinate the woman in question, but after meeting her, she realizes Minato is a very nice woman and understands why her brother fell in love with her.