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:
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 / ALFA-X / Aware! Meisaku / Petit Seka (cv: Saki Fujita)
MEIKA Hime & Mikoto ~ Hakata Mentai! Pirikarako-chan (cv: Kotori Koiwai)
Luka ~ Copihan (cv: Yuu Asakawa)
Meaw (possibly) ~ Honto ni Atta! Reibai Sensei
Go! Go! 575
Zunda Horizon

Prioritising first appearances/multiple artists bc of 50 limit. For composer entries, the singer is only listed if they're
At some point, I'd have been super hyped for any show with a Vocaloid producer but come late 2010s they've been popping up everywhere :')

*List is roughly sorted by anime based on Vocaloid songs > Male utaites > Female utaites > Producers

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).

Anime that features battles performed with toys.

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)

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.