Why is your Wizard THE Wizard?
She invented magic herself. No one can do arcane magic but her.
You are the chosen of the goddess of magic. Your blood is arcane fire and your gaze pierces every silly trick.
You come from the most fabled line of elven spell singers and carry the weight of your destiny with you, even though you wanted to become a ranger and go fight the northern tundra orcs.
You are the seventh daughter of a seventh daughter and prophecy says its your job to balance magic again.