Professor's son (Ken)

Professor's son's real name is Ken Kitazawa (北沢ケン, Kitazawa Ken) is the Professor's son and he is a young genius. He invented Chemical Z. He is home schooled by his father and is much more educated than the girls, although he is only 8. He sees the girls as older sisters. The girls once tried to act as his mother, due to him not having a loving female figure in his life.