Hikaru was the companion of the Ginga Wolf. He had the power of lightning. He rode a horse named Yellow Thunder. He was the silly one of the group, but he did have an element or two of seriousness in his character. Once he lightly blasted some children who were teasing the horses, and he and Hayate got in a heck of a fight over that. He was not involved with anyone over the course of the series, however he did befriend one of Battobasu's men, the creature Degiusu. He was young, and wild, and funny.