Florian was a 10-year old girl, with shoulder-length blonde hair, and light blue eyes. She was only ever seen wearing a plain white robe with a long white v-neck dress and a black waistband with white sandals.
In the year 845, when Wall Maria is breached, Grisha Jaeger invades the Reiss Chapel, turns into a Titan, and kills most of the Reiss family members including Florian herself. According to Rod Reiss, she was "stomped" together with her mother in Grisha's feet. Before Grisha attacked, she fearfully clung to her mother.