What Idol Groups in Love Live have real life counterparts?

Question

According to this question, both μ's and Aquors are real life groups.

So, I am wondering what other groups that are mentioned in Love Live! School Idol Project and Love Live! Sunshine!! are also based off real life idol groups.

Answer 1

In Japan, they are generally called as seiyuu unit (Japanese Wikipedia) when a music/acting unit (group) consists of voice actors. For a special case where a group also works as a real-life idol, it is called seiyuu idol unit.

According to the Wikipedia, there are 3 units, but only 2 are seiyuu idol units:

• A-RISE (created for Love Live!, no live event/talk)
  • Kira Tsubasa: Sakuragawa Megu
  • Toudou Erena: Matsunaga Maho
  • Yuuki Anju: Ohashi Ayuru
• μ's (created in 2010 for Love Live!, 6 live events, 4 live talks, 18 guest appearances)
  • Kousaka Honoka (Leader/Printemps): Nitta Emi
  • Ayase Eli (Bi Bi): Nanjo Yoshino
  • Minami Kotori (Printemps): Uchida Aya
  • Sonoda Umi (lily white): Mimori Suzuko
  • Hoshizora Rin (lily white/NikoRinPana): Iida Riho
  • Nishikino Maki (Bi Bi): Pile
  • Toujou Nozomi (lily white): Kusuda Aina
  • Koizumi Hanayo (Printemps/NikoRinPana): Kubo Yurika
  • Yazawa Nico (Bi Bi/NikoRinPana): Tokui Sora
• Aquors (created in 2015 for Love Live! Sunshine!!, 2 live events, 5 live talks, 3 guest appearances):
  • Takami Chika (Leader/CYaRon!/Gu~RinPa): Inami Anju
  • Sakurauchi Riko (Guilty Kiss): Aida Rikako
  • Matsuura Kanan (AZALEA): Suwa Nanaka
  • Kurosawa Dia (AZALEA/Gu~RinPa): Komiya Arisa
  • Watanabe You (CYaRon!): Saitou Shuka
  • Tsushima Yoshiko (Guilty Kiss/Gu~RinPa): Kobayashi Aika
  • Kunikida Hanamaru (AZALEA): Takatsuki Kanako
  • Ohara Mari (Guilty Kiss): Suzuki Aina
  • Kurosawa Ruby (CYaRon!): Furihata Ai