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. He’s developed a deep hatred and grudge over Iori Yagami, not just because of his rivalry in music bands, but also because Iori’s an obstacle to Orochi's revival.
While Yashiro take his role as Heavenly King seriously, it isn't an outstanding priority. His bandmates (and friends) are Chris and Shermie.