Sydney Solis, up until Chapter 3, is actually mute, plus being a little shy anyway as she's the newest member of the Solstice Foundation. Throughout the story, she's able to warm up more to her new friends, and is able to make happy memories despite the hard times that have fallen apon the world.

Sydney...sounds adorable. She is baby. Her voice goes with her short stature,but that doesn't mean she can't be mature sometimes, too.

Sydney is 17 years old, don't question it.