Sylfie is the younger sister of Millefie. She is a stark contrast to her older sister, being very social and interactive, while Millefie is known to be extremely reclusive in the army. She is particularly fond of social networking and hopes to gain many followers. While fond of taking pictures and sharing them on social media, is also careful to avoid leaking sensitive information to the enemy with her pictures, although her activities are often frowned upon by the other members.