Fionn has a strong and strict personality, and does not hesitate to give big lectures (or even beat up) anyone who does something she considers wrong; She has high expectations about men and is much ruder with them, it's rarer for her to get angry with a woman, despite that, has a warm and pleasant side that she doesn't like to show very much. She feels insecure because she thinks she is not "feminine" enough. She thinks that she deserves to be the manager of the coffee shop instead of her twin