>Munou na Nana
I'm a sucker for autistic protagonists and evil cute girls so this really hit the spot despite the asspulling that happened later. S2 never ever.
>Akudama Drive
/animu/ hated this because MC wasn't a waifu. Still fun as fuck. Between this, loli Odin and Nana Fall 2020 was the season of redpills.
>Jibaku Shounen Hanako-kun
This one is memorable just for turning QUALITY into an art form. Every scene has the bare minimum animation to get the point across and somehow the final product doesn't look like shit. It helps that the series is light on action so voice acting and plot can carry it. Hanako-kun's VA is the perfect blend of smug and creepy
>No Guns Life
Goofy cyberpunk action, somehow managed to avoid taking itself too seriously for most of the run. Also I want to massage Mary's asscheeks.
>Senryoku no Sigfrida
Like Strike Witches but better in every way because it has a plot, characters, and reasonably high quality animation.
>Ishuzoku Reviewers
Almost forgot this was a 2020 anime. Deserves an honorable mention just for the volume of asshurt it caused. If you liked this check out World of Moral Reversal by the same artist.
And the true #1AOTY
MOTHERFUCKING MEWKLEDREAMY
It's telling of the absolute state of the industry that a 25 minute plush commercial for little girls is the best thing out there. Characters get development, the antagonists are sympathetic, it breaks from formula just enough to avoid getting stale and there's the rumblings of an actual plot hiding in the background. Highly recommended.