isu (あいす) is an utaite known for his smooth, boyish voice, with a slightly nasal yet pleasant lilt and distinct, rich vibrato. Though he usually sings in a mid-range register with his voice normally being described as ikemen-type, he is also capable of shifting registers to a "cuter", higher-pitched, more feminine voice - most notably audible in his cover of "Kaitou ・ Kubozono Chiyoko wa Zettai Misuranai" Nv.