Ple-Sen
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For Sunny, here is an approximate list of j-pop artists whose songs I like (or at least some of their songs):
Miwa
Megumi Hayashibara
Inoue Joe (to be honest, it was difficult to determine the genre here, and I'm not sure if it's j-pop, but I'll mention it just in case)
High and Mighty Color
SID
funkist
Toshihiko Sahashi (anime fans also know him as the voice actor for Rokudo Mukuro (also known as the pineapple illusionist))
Kohmi Hirose
Takanori Ohyama
Sukima Switch (they might also be j-rock; it's just not always possible to determine the genre of bands, because some songs may sound "poppy," while others don't, so there may be some inaccuracies, and some of these are j-rock bands)
NICO Touches the Walls
YUI
Boa (I highly recommend her, at least her song Duvet is amazing)
Tohoshinki
D-51
Namikawa Daisuke (also known as Italy, or Ulquiorra, depending on your preference)
Ayumi Hamasaki
Suitei Shoujo
Shoujo S
This is just off the top of my head; I haven't gone through my entire playlist yet, there are a few more artists there. Oh, and I also recommend Vocaloids, although there is a VERY wide range of genres there
Miwa
Megumi Hayashibara
Inoue Joe (to be honest, it was difficult to determine the genre here, and I'm not sure if it's j-pop, but I'll mention it just in case)
High and Mighty Color
SID
funkist
Toshihiko Sahashi (anime fans also know him as the voice actor for Rokudo Mukuro (also known as the pineapple illusionist))
Kohmi Hirose
Takanori Ohyama
Sukima Switch (they might also be j-rock; it's just not always possible to determine the genre of bands, because some songs may sound "poppy," while others don't, so there may be some inaccuracies, and some of these are j-rock bands)
NICO Touches the Walls
YUI
Boa (I highly recommend her, at least her song Duvet is amazing)
Tohoshinki
D-51
Namikawa Daisuke (also known as Italy, or Ulquiorra, depending on your preference)
Ayumi Hamasaki
Suitei Shoujo
Shoujo S
This is just off the top of my head; I haven't gone through my entire playlist yet, there are a few more artists there. Oh, and I also recommend Vocaloids, although there is a VERY wide range of genres there