Saya Shiroyama

 is the tritagonist of Mobile Suit Gundam: The Singing Serenade. She is a civilian who is Catherine Kennedy's childhood friend and the daughter of Sho and Arisa Shiroyama, the former who is also her English teacher at Emerald Tower high school during the story.

Personality
Saya's personality greatly contrasts to that of Catherine's. While Catherine is serious and mature, Saya is very shy and a crybaby that has a tendency to cry over the smallest of things. She is also self-conscious and tends to act socially awkward. In spite of all this, she is determined and loyal to her friends and family.

As the story progresses, she starts to overcome her shyness after helping Catherine defeat most of Maximilian's soldiers midway through the story, thus developing a newfound sense of self-consciousness and determination by vowing to protect her loved ones. She also becomes more dependent on herself as well.