Personality: 

Yuki is a very outgoing and optimistic person who shows some signs of perverseness. She doesn't seem to mind taking in outsiders in her home, and can be very spontaneous. However, she has shown to have a more serious and knowledgeable side to herself as well, and cares very much to the well-being of others. Her relationship with Tōya Kagari and Hinata Himezuru demonstrates this, as she adopted the both of them once she became old enough, having made a promise to them both that they would be a family in the future.

She is well aware of the existence of Unions, containing an incredible amount of knowledge about their biology and treatment. At work, Yuki is far more strict and takes a no-nonsense approach with her patients.

At one point in her life, after the death of her parents, she became extremely depressed to the point of, aside eating and going to the restroom, doesn't do anything. After meeting Hinata, she regained her cheerfulness.