Miyazaki has sung several songs in the Digimon series. He sang the digivolution theme song for Digimon Adventure called "Brave Heart" and its Digimon Adventure Tri remix. He also sang the two digivolution theme songs for Digimon Adventure 02, called "Break Up" and "Beat Hit!", respectively. In addition, he sang the second evolution theme for Digimon Frontier, called "The Last Element". Moreover, he collaborated with other Digimon song artists in Yūki o Uketsugu Kodomotachi e(勇気を受け継ぐ子供達へ?, lit. "To the Children Who Inherit Courage") and "WE ARE Xros Heart! ver. X7". He also sang the theme song for Mushrambo, called "Power Play".
His father is Naoshi Miyazaki （宮崎 尚志）and his elder brother is Michi Miyazaki （宮崎 道）, who are both composers. He was a guest at Expo Anime Brasil 2006 in São Paulo.