Busou Shinki Moon Angel

Shows based on Vocaloid originals or involving utaites/producers who are/have been active on Nico Nico Douga (extended to YouTube for newer gens).
While not its own genre, these compositions tend to have a recognisable feel to them.
(Updating as I come across songs, you can poke me to add stuff as well :D)

2nd stack for post-2020 anime debuts: https://myanimelist.net/stacks/26372

Actual Vocaloids/Other voiceroids:
GUMI ~ Joshikousei no Mudazukai / Agukaru: Play with Ibaraki-hen (cv: Megumi Nakajima)
IA ~ Recorder to Randoseru Mi☆ (cv: Lia)
Miku ~ Akikan / Watamote / Yami Shibai / Black Rock Shooter / Kemurikusa / Shinkalion ALFA-X / Aware! Meisaku / Petit Seka / Ani × Para (cv: Saki Fujita) / Nmeneko
MEIKA Hime & Mikoto ~ Hakata Mentai! Pirikarako-chan (cv: Kotori Koiwai)
Luka ~ Copihan (cv: Yuu Asakawa)
galaco ~ Classicaloid (cv: Kou Shibasaki)
VY1 ~ Genshiken Nidaime
Kasane Teto ~ Gnosia

Meaw (possibly) ~ Honto ni Atta! Reibai Sensei
Go! Go! 575
Zunda Horizon

Luo Tianyi ~ Wan Sheng Jie (JP version features CevIO AIs Satou Sasara & Suzuki Tsudumi)

Prioritising first appearances/entries with multiple artists because of 50 entry limit.

*Grouped by: Anime based on Vocaloid songs/themed media > Male utaites > Female utaites > Producer units > Producers & sorted oldest to newest in each category

This is a comprehensive list of anime featuring bikini-clad girls in science fiction settings.
My Affiliate Fantasy Bikini Armor Anime Stack link https://myanimelist.net/stacks/12239

Shows with a song performed by MIO (also known as MIQ).

Masayuki Kojima is a Japanese animator, storyboard artist, and director, best known for directing the acclaimed anime series Monster and Made in Abyss. He was born on March 11, 1961, in Yamanashi, Yamanashi, Japan.

All OVAS,ONA,Special, TV Special with Opening for AMQ, Famous or not!

(Openings being single, not part from TV series)

Parts 1-11
https://myanimelist.net/stacks/54788
https://myanimelist.net/stacks/54790
https://myanimelist.net/stacks/54791
https://myanimelist.net/stacks/54792
https://myanimelist.net/stacks/54793
https://myanimelist.net/stacks/54795
https://myanimelist.net/stacks/54797
https://myanimelist.net/stacks/54800
https://myanimelist.net/stacks/61415
https://myanimelist.net/stacks/67675

Anime about full on robot girls or girls piloting Mecha Armor (not giant robots).

Animes with Mecha Musume style or similar styles. Basically, this consists of combining cute girls and mecha design or armor. More information about: https://myanimelist.net/featured/1627/All_About_Mecha_Musume

Anime featuring a relationship between a guy and a tiny girl, be it romantic or just friendly.

Short animes that I think are underrated, more will be added