Haha the above two are both Korean but that's cool.

Mine are 飯田絢香 (Iida Ayaka) and 西野カナ(Nishino Kana).

Ayaka have more raw background instruments (not techno), for example, her song WINDING ROAD collaboration with Kobukuro, her cover of 空と君のあいだに, and にじいろ.

I like Nishino Kana because her voice isn't as high pitched and childlike compared to most J-Pop artists. Most "J-pop" have really fast tempo whereas Kana's are mild. She also have English lyrics in most of her songs so at least I can sing along to those parts haha.