I like Oshare Kei and J-pop but there's a very specific image/sound that I like.
The group I like that is closest to the image/sound that non-Jpop fans think of when they see the word J-pop is Doll Elements and Perfume.
I mostly listen to groups/artists like:
5ignal
Banana Lemon
CANDIES
CHERSEE
Da-iCE
Daichi Miura
DAOKO
E-Girls
EBiSSH
EXILE
FAIRIES
FAKY
FEMM
FLOWBACK
FOXXI MISQ
Giselle4
Lead
Koda Kumi
MACO
MADKID
ONE N' ONLY
Predia
Reol
Tokyo Gegegay
Sandaime J Soul Brothers
SDN48
Sheena Ringo
W-inds.
X4
But I also listen to songs by:
ADDICTION, Aisha, ANTIME, AOS, Berryz Koubou, BLACK IRIS, Blue Moon Boo, C-ute, Chanmina, Chu-Z, Crystal Kay, FAMM'IN, FREAK, HYNA, (not to be confused with Hyuna), Juice=Juice, m-flo, Moritaka Chisato, Morning Musume, Nissy, N0Name, Orange Port, PrizmaX, Riri, ROZE, Sky-hi, SweetS, Tanaka Alice, THE RAMPAGE from Exile, Tokyo Girl's Style, Tomomi Itano, WhiteA, YsR,