Isabel Wiseacre is an average height, light-skinned girl. Her posture is athletic, not necessarily skinny and she moves in a very composed manner. She's got dark brown curly hair and freckled splattered over her nose and cheekbones. Her eyes are brown and her cheeks are rosy.

Though she tries her hardest to come across as well-mannered, polite and demure, something in her eyes tells you she's more mischievous than she lets on. She performs well in school, tries to always take the moral high-ground and is a self-proclaimed pacifist. Kindness is very important to her and social interactions come easy to her. Her quick wit makes her judgemental, when she decides not to keep things for herself they come out cuttingly. Everyone in her immediate surroundings have always treated her like a princess, so impatience is a vice of hers.

Her parents are muggleborns, and are goldsmiths. They run a shop inherited down through generations, in the centre of Leeds. They have always been very well off. Her older sister has a strong affinity for goldsmithing and is expected to take over the shop eventually. Izzy does not and always felt like a bit of an outsider in her family, even though they loved her very much. The private school she went to was very competitive in nature, making her a disciplined student as she lacked the talent to keep up with minimal effort. She did however have a wide circle of friends and good relationships with the teachers.

When Izzy turned ten she got the materials from her parents to make herself a necklace with a small ruby, a family tradition. She tried and tried to turn it into something beautiful but it just wouldn't work. Growing increasingly frustrated she broke the setting she was working on, she broke down crying and decided she would give up on the necklace. As she got up to throw it away, she felt a surge from her chest and saw the setting magically fix itself in her hands. Two days later a Hogwarts representative showed up on her doorstep to tell her she was a witch.