After Joint Texture, .gif textures (animated)
would look pretty good.
Animated Head Texture 128x128, 256x256, 512x512
etc..

+With an option of disabling them on the client side.

I personally like the idea.

im pretty sure much computers wouldnt be able to handle that.
also how would u do that ? does the texture just play the animation all the time, or if u got a 10Frames animation, is it playing these 10 frames similar to toribash? (that would be pretty cool but really hard i think to do.)
with an disable option maybe..
actually not supported until u maybe explained a bit more how this shall work..

Let's say I have 5 different unrelated image

Then, make those 5 image as a gif
I put this image to an animated head
If 1 frame in gif equal 1 frame in toribash
a space would cause the animation loops 2 times
a default replay [500 frames] would cause the image loops 100 times
For one texture

Then, I bought a pair of animated hand and foot
Thus, there's 5 animation total

I make another 5 different unrelated image animation for each texture

5 texture x 5 image in gif x 2 loops = 50
That'll render 50 images in a space
For one Tori without full set

If i purchase a full set
It'll be 16 total (Limbs only, idk if you suggested animated joint too)
and if i put another animation
It'll be 16 x 5 x 2 = 160 images per space
For one Tori

And let's go multiplayer, there's another guy using different animated texture
Double the value

i simply love this idea, because I am an animator
but i doubt it'll hardly supported because lag, glitch, and stuff

Over 20 animated textures in 512x512 seems like a pain in the ass.

Keep in mind, .gif is limited to 8-bit color. It wouldn't be particularly expensive computationally, but I don't think it would look as good as you think it would, it would require a fair bit of rewriting on the texture uploader, and it would require adding another texture format client-side as well.

Gifs are yucky. It's an interesting thought, but it just wouldn't be worth it.

You'd better get head states
One for each state,
Hurted, hitting, normal,knocked.
So 4 head textures for a high price, incluiding items for states

If this idea were actually implemented it would wreak havoc on my computers grapics card, I don't think most people would be able to run this.
not supported

Again, .gifs actually aren't that hard on the GPU.