Yuko is a great character, my second fave of the Happiness Charge team. She doesn't have much in terms of character development, but much like Ageha in Hirogaru Sky, she didn't need to cause she was great in her own way. Very sweet, sincere, and does provide some interesting insight on a lot of things. A lot of people tend to forget you can have characters not develop, but still shine through with her own traits, and with Yuko, she constantly showed those traits. She served her role as the team Mom well, and I really love that song of hers.