The Zen'ō seems to enjoy Gokū's casual attitude, so much him he threatened to destroy his servants for threatening Gokū for having other priorities than to spend time with the Zen'ō. he is tired of all the formalities and is happy to meet someone who treats him like a friend rather than a ruler. He also enjoys how Gokū's casual handshakes moving him up and down and has mentioned no one else has dared to do it In spite of his childish nature, the Zen'ō does have a sense of responsibility