Lazuli used to be kind and gentle like her sister, but when their dad abandoned them, she became afraid of anyone around her. In fact, she started to not trust anyone and closed her heart. During her first few interactions with Speed, Lazuli often shows to be short-tempered and aggressive, as she usually punches him. After all the time she passed with Speed, Lazuli slowly changed her opinion about the people around her. She learned to trust everyone and not just herself. She loves to read.