Kentaro begins the story as grade-school-aged brat, generally seen trying to get between his mother and her bottle. Initially, he is antagonistic towards Yusaku, but events soon see him to look upon Yusaku as an "alright guy". Unlike the bickering relationships between other of Rumiko's teenage and child characters such as Ataru & Ten or Inuyasha & Shippo, their's isn't continuous. He is also very fond of Kyoko, especially because he sees her as the one of sane person in the building. He develops a crush on Kyoko's niece Ikuko, reminding Yusaku of himself, although Kentaro resents the comparison.

(Source: Wikipedia)