It won't do the logic for you. But you can create duplicates of the character sprite on your own. And then assign a Vfx Toolkit Material to it to make it look nice.
The asset is all about a shader + tools to create Vfx. The game logic is always for you to do however you want and need
Viewing post in All In 1 VFX Toolkit for Unity - Demo comments
Well, to create afterimage effect like celeste I would assume I need to copy player current sprite from spriterenderer and use it as texture for the VFX asset before spawning it.
Can this VFX asset change the texture it used during runtime? Also, can sprite used on spriterenderer used as texture for VFX asset?