As seen in several videos, Fen has a very violent and ruthless demeanor, as she is often associated with violent behaviors. However, it can be inferred she is kind to those she is close to, for instance, Xister Fen has fair skin, with her arms and legs being replaced with black claws. It has spiky strawberry blonde hair that goes all the way past her knees. Her feet are pointed and black. Additionally, she has an ahoge atop her head and a bandage wrapped around a strand of her hair at the botto