Rune Kodaira

Rune Kodaira is Yamato's best friend since the fifth grade at the start of the series. However, he is currently the master of Jealous, making them enemies.

Appearance
He is a rather short, skinny boy for his age. He has amber eyes, which are often hidden behind glasses. He has shoulder-length blond hair with bangs.

Personality
In the beginning of the series when he is first introduced, Rune is shown to have a collected, almost insecure personality. His concern for Yamato is clear, as he tries to stop him from selling his bag at the Antique Shoppe. After he becomes Jealous' master however, he becomes more confident and sinister.