Sunny is a visibly young girl with a petite build and short height. It appears that she wears a white long sleeved shirt with a red skirt underneath. Her dark brown hair is fairly long, going down to her shoulder blades and is kept tied back in a pony tail with a red band. She keeps her hair styled with trimmed bangs going straight across her forehead.
Sunny is first revealed in a flashback by her brother Conny Springer in which he remembers her playing with their little brother Martin. During this time, Conny worries for Sunny's safety as he searches their village of Ragako looking for survivors after news that Wall Rose had been breached by Titans coming from the south, the same location as their home town.