Mari Katsuki

Mari Katsuki is the daughter of Toshiya Katsuki and Hiroko Katsuki and the older sister of Yuuri Katsuki. Mari works at the family hot springs Yutopia Katsuki in Hasetsu. She is the only character seen to smoke. She is shown to mostly have a laidback personality only entering the vicinity when necessary. However upon seeing Yuri Plisetsky for the first time she becomes excited as he supposedly looks just like her favorite band member. Though she usually seems disinterested in what goes on around her she is supportive of Yuuri and his skating career. Source: Yuri On Ice Wikia