Diamond Daydreams (Diamond Dust Drops) (Kita E): Nurse Yuki.

Yuki is a young nurse working at the hospital where Karin is staying.  She was secretly sending encouraging messages to her  patient under the name 'Your Fan' leading to a misunderstanding.  She had been dating Dr. Amakasu since high school.

Bonus: Unnamed characters 

Love Live: Nijigasaki High School Idol Club: Setsuna Yuki (Nana Nakagawa)

 Nana Nakagawa is the student council president of Nijigasaki High School.  She also comes from a strict family that did not allow things such school idols in their house; as such Nana adopted the name Setsuna Yuki for here school idol personality.  She also hid her identity by removing her glasses and trading in her braded pigtails for a pony tail.  Setsuna is energetic and hard working and can sometimes get carried away talking about her otaku hobbies.  She is also likes almost all of her school classes and works hard at her studies.