Yami Shibai

Anime that are so bad, you can't look away!

Anime with shorter than average Episodes that are quick to finish.
Most of them but no exclusively comedy.
Not including sequels.

Anime where the average episode runtime is under 20 minutes

The parameters for this list are as follows:
- Episode duration between 30 seconds and 14 minutes
- Episode count of 4 or more episodes total
- Standalone Series only (Sorry, Koyomimonogatari)
- First seasons stand for the whole franchise

This list includes arthouse (gonna strech this term in this list) that are have multiple episodes that from one story, so compilations like Neo Tokyo or Genius Party will not be in here.
Expect TV anime series and OVAs (they usually have 3-6 episodes 20-40 minutes each).

Regarding TV anime, here you'll find more "modern" series like Kaiba, Haibane Renmeim Flip Flappers, Sonny Boy, Artiswitch which feel a bit different from 80's shows but are still very unique compared to your typical anime so I believe they qualify.

animes with episodes under 20 minutes

A collection themed around the spookiest time of year, but it's always Halloween in my soul...

While most of this list falls under the horror/suspense/mystery genres, there are a few included based on their heavy themes of zombies/ghosts/vampires, etc.

This list ranges from incredibly good to laughably bad, so I've ordered it by score so you have a better idea of what you're in for. Sequels are not included.

Witches, vampires, demons, and magical girls… what more could you ask for?

This list was created for anyone interested in seeing something terrifying.There is from the low to high level of horror here, chose for u self.

All the seasons of the Yami Shibai series
Yami Shibai is a horror shorts series told in the style of kamishibai (paper theater).
Each episode is about 5 minutes long!

Based on comments from the community, I present a list of animes which have a peculiar appearance which caused most to confuse them with western cartoons.

about Avant Garde genre,

Experimental fiction which shunned conventional storytelling at the time it was created. These stories often invoke unsettled feelings because they reject traditional ways in which we prefer to view (or escape from) the world. Narrative is avant garde works is often of higher importance than the content.

Deconstructions often fall into this genre. Note that simply being darker, edgier, or cynical doesn't mean the work is avant garde.

about the weirdest anime, well, actually I just said it, it's just some bizzare animes, I don't think I'm capable of understanding them all, but why not try? Weird things sometimes have interesting things hidden.

It's no secret that anime can get pretty weird sometimes. Many series take their audiences on a mind-boggling ride, leaving them to question everything they thought they knew about reality. While just about every anime title is weird in its own way, some are just beyond strange. They play with the audiences' minds, relying on psychological storylines and eccentric characters to keep everyone guessing.

Sometimes they don't even feel real at all and seem more like a strange dream. A lot of times, these kinds of series are too much for general audiences, becoming far too confusing to keep up with. But for those who enjoy the challenge, these anime are the perfect watch.

There are totally weird-anime titles that I have put on my other stacks before so I will not want to list them here because this is not a list to evaluate the quality of anime of different themes.

This is just what I found quickly, this list may change in the future

Animes with the horror, paranormal and supernatural genres.

Anime that are not as well-known.

This list covers any anime that utilizes vocal synths (VOCALOID, UTAU, CeVIO, Synthesizer-V, etc.) in some sort of way. This mostly focuses on direct usages of vocal synths within the shows, but some of the entries here are attached for more unusual reasons.

Note that I will not be counting song videos for this, nor am I cataloging simple references to Miku (so no Hyouka, for instance). I also may not have everything in-scope listed; these are just the ones I know about. If I'm missing anything, please let me know in a DM!!

The order's a bit messy due to odd overlap areas (thanks, Jashin-chan), but here's the basics:
-Shows based on Vocaloid song series [1-2]
-Shows with official, licensed voicebanks [3-5]
-Shows that utilize vocal synths in-show for non-musical purposes [3, 6-7]
-Shows with vocal synth characters (i.e., Hatsune Miku) [3, 7-11]
-Shows with vocal synths used in the music [1, 3, 9, 12-31]
-Shows that cover vocal synth songs [1-2, 32-35]
-Shows that reference vocal synth technology as a plot point [27, 35-36]