Ooo Morimo Clover Z are awesome x3 (and they're singing the new Sailor Moon opening hehe) I also like Super Junior, Shinee. I like loads if I'm honest.
Edit: Oh and my favorite vocaloids would be the Kagamine twins and Miku.
My top 5 Kpop groups - Super Junior, B1A4, B2ST, Block B, U-Kiss
Teen Top is creeping up there because I went to one of their concerts in North America and it was amazing <3
i LOVE kyary pamyu pamyu, even if she isn't a group! as for KPOP groups, i like CNBLUE, SNSD, boyfriend, infinite and a lot of other groups/artists uwu
i like a lot of vocaloids, but some of my favourites are gakupo (power & whisper), KAITO and soft append miku!