Koru is one of the main characters of Cyber Fusion. Like Hinamori Amu, he is the lead protagonist. Koru's main icon is a circle with a pair of sharp wings, prior to an unknown Guardian Character hatched off. He is given the title as The Prince of Space (宇宙の王子 Uchuu no ouji?). His alter ego is Amulet Sonic (アミュレットソニック Amyuretto Sonikku?).