Нішіґорі Юко

Yuuko Nishigori is a childhood friend of Yuuri Katsuki and Takeshi Nishigori (whom she is married to).

Yuuko has a very colorful personality and is extremely bubbly. She is also a very supportive person, standing up for Yuuri when they were younger, and then encouraging both Yuuri and Yuri to do well. Yuuko is a caring parent, trying her best to properly educate her triplets to sleep early, but her parenting efforts rarely match her intent and she is often frustrated by their behavior.

Yuuko has been very passionate about figure skating ever since she was young. Though she no longer skates competitively herself, her love for the sport is still clearly evident; she is a huge fan of Victor, and her daughters are all named after skating jumps.

(Source: Yuri!!! On Ice Wikia)