Walnut Duck is a huge fan of Holmes; he learned all of Holmes' bravery, action, and erudition. But in real life, the nature of life changes with every change of scenery, and whether it's clothing or personal attitude, it changes with every environment. Therefore, Walnut Duck has three distinct personalities, and he has always won the hearts of many young people with his cute appearance and sunny personality. His slogan, "All My Best, Be Myself," has inspired young people to be brave and to be themselves.

Fans can distinguish Walnut Duck's three personality states by different colors: the original self, the ego, and the superego.