Kai's Grandfather

Kai's Grandfather is a character in Lu Over the Wall. He is the grandfather of Kai. He is avoided by everyone is Hinashi.

Personality
Kai's grandfather is very strict. He doesn't like his grandson playing music by the ocean, as he believes that is what caused mermaids to kill his mother.

Story
Near the end of the film, he reunites with his long lost mother who is revealed to be a mermaid and stays with her.