Kai Ashimoto

Kai Ashimoto is the main protagonist of Lu Over the Wall. Kai is a middle school student whose parent's divorced and whose father moved both Kai and him to Hinashi town.

There, he meets two outlandish classmates who are interested in him joining their band. Though uninterested at first, he finds that its a good opportunity to look into the merfolk that are rumored to be in the area. He meets Lu, a child mermaid, who helps him have fun.

Personality
In the beginning of the film, Kai is shown to be dismissive, blunt and withdrawn. However, after meeting Lu, he becomes more fun-loving and cheerful. Thanks to Lu, Kunio, and Yuho, he begins to be more positive about his future.

Appearance
Kai is a fair-skinned middle school kid with black hair. He wears a blue shirt and short, grey sweatpants.

Story
Kai was originally born in Tokyo, the son of a dancer named Naoko and a musician named Teruo. Kai moved to Hinashi Town with his father and moved into his grandfather's home and umbrella shop. Kai's father seemed to completely lose interest in music from then on, and his mother supposedly stayed in Tokyo, making a living on her own as a dancer.

Lu
Kai and Lu have a very positive relationship. Throughout the film, the two form an unbreakable bond. Kai will go out of his way to protect Lu from danger. Near the end of the film, Kai assures Lu of his and everyone else's platonic love for her. As friends and not boyfriend and girlfriend

Trivia

 * Kai's hair was originally going to be blue.
 * Kai tells Lu during their night out that he never likes anyone after they see two people kissing, but Lu misunderstands what "like" means and confuses it for the platonic "like", which leads her to kissing her friends. Despite Kai's strictly platonic feelings for her, he's fine with letting her give him kisses.