Ask yourself who is the most important person for yourself! This is a question with no true answer unless rise (復活). How do you know who is the most important person of another human being? You might think that Princess Diana had writtern the answer on her diary or had announce in the public. But is that true? Can't she tell a lie? and even thought she claimed that she was telling the truth, but anything happened after what she claimed can change her thought and feeling on another person and can be changed anytime, anywhere before she died. However, if I must give a name to answer this question, I would say her parents, since her parents are the one who bought her to the Earth so that she can explore world, enjoy her life, and have feelings and thoughts.