Haru is a yellowish-orange rabbit who wears glasses and carries a book, establishing his bookish and highly intelligent nature. He is a loyal and supportive friend, maintaining close bonds with Chima, Gaku, and Meru. He is particularly devoted to Gaku and harbors a secret romantic interest in Meru, which often makes him shy in her presence. His older sister, Elle, shares his calm temperament and enjoys studying flowers and fireflies. In the series' epilogue, Haru marries Meru, and they have two children: a daughter named Miru and a son named Arl.