While living his normal life, Yashiro has a very 'cool' personality. Even so, he shows a part of his Heavenly King persona while composing his songs, which often has themes like death and blood.
Due to being upstaged in one of their gigs during the events of The King of Fighters '97 by Iori, he has developed a deep hatred and grudge over him. This, on top of the fact that Iori's a natural enemy of his, which he either does not know nor care about.
