regular:

• morning musume (2003-2014 lineups)
• dempagumi.inc (0T6 (moga + nemu lineup)
• kumi koda

casual: (all are very casual except vocaloid bc i know more abt it)

• ℃-ute
• berryz kobo
• babymetal (OT3 lineup)
• momoiro clover z
• ayumi hamasaki
• utada hikaru
• kavka shishido
• FEMM
• chanmina
• E-girls
• leo ieri
• akb48/some other 48/46 units
• vocaloid (look at caution note before discussing)
• love live! (character and seiyuu songs)