Girl X

https://en.wikipedia.org/wiki/Clay_animation

Includes clay, gypsum, and plasticine animation.

Part 1: https://myanimelist.net/stacks/30395
Part 3: https://myanimelist.net/stacks/50904

Welcome to the black hole of anime.
The weirdest, most unsettling, gory, nonsensical stuff I somehow managed to enjoy.

These stacks are meant for cataloguing every stop-motion animation on Myanimelist. The list is the result of research by the Stop-Motion Animation Appreciation Society:

https://myanimelist.net/clubs.php?cid=16200

Stop-motion is a form of animation in which objects are manipulated little by little while each frame is shot separately. Puppet animation is the most common, but before 1935 cutout animation was also very common. Among other types are claymation, pixilation (now removed from the database), object and model animation. In this list also works using sand, charcoal or paint are included, since in the form they've been accepted to MAL, they also include gradual manipulation and shot by shot filming.

Part 1: https://myanimelist.net/stacks/47018
Part 2: https://myanimelist.net/stacks/47020
Part 3: https://myanimelist.net/stacks/47021

Part 5: https://myanimelist.net/stacks/47023
Part 6: https://myanimelist.net/stacks/47026
Part 7: https://myanimelist.net/stacks/47027
Part 8: https://myanimelist.net/stacks/47032
Part 9: https://myanimelist.net/stacks/47034
Part 10: https://myanimelist.net/stacks/47035
Part 11: https://myanimelist.net/stacks/47036
Part 12: https://myanimelist.net/stacks/47038
Part 13: https://myanimelist.net/stacks/49186
Part 14: https://myanimelist.net/stacks/51880

Creepy clay and petrifying puppets.

The Stop-Motion Animation Appreciation Society: https://myanimelist.net/clubs.php?cid=16200