What is Yuichi Nakamaru's personality?

Excellent personality, very gentle ~! An adhesive called KT. And good for his two sisters. Maruko is the prince who eats screws because he is nervous. The newly revised CTKT and Aunt Cai are sitting in a small sofa, but they are cute. It is said that there is a sharp phobia. I really want to have a brother like Maruko!