I will use the same character through many of my books and can trust people not to make a fuss about it, here is her profile;

Name: Bella
Race: Half-Human, Half-Demon
Gender: Female
Weapon: Katana/Sword (depending on the story)
Abilities: Has not discovered any yet
Personality: Overconfident but highly intelligent. Never works with anyone
Looks: Long pitch black hair (some hangs over her left eye (eye patch over left eye)) has red eyes