Question Is there some way to reduce memory usage when use a large number texutre2D in unity

As we know, texture2d will save all the pixels and can be huge in RAM. But I want to reduce the RAM usage.
my question is not about compression. I need to read a file to RAM (For example png file) and DO NOT using texure2D,because it's so large.I want to draw sprite by GPU compute and don't increase RAM usage.

Recently I played a game named Blazblue and I found that RAM just use hundreds of Mb when the scene has 2 characters and 3D background.Though the game is not developed by Unity.In this game's assets I found that a character include about 1000 frames and It's not bone sprite. If they are read to texture2D,a character can be about 2GB size in RAM……Blazblue‘s sprite file has it's own struct and maybe like png files

So I think there maybe a way to draw sprite without texture and use less RAM. And Because of reducing RAM usage, GPU will be used. In my limited knowledge, maybe Compute Shader can do this, but many mobile phones are not support it.

Anyone can tell me how to resolve it or any else game engine can do it, thanks very much!

 

Thanks a lot for your reply,finally I have reduced the RAM usage to about 100MB by using shader to compute Alpha8 texture and it's palette.