@Meow ♪
I'm not an expert on it myself, but you can be done using Blender.
It doesn't sparkle much in VRoidHUB, but it will sparkle even more in VRMLIVEVIEWER.lol
Thank you so much.😁
The sparkly parts use a different shader.
It's not the Mtoon shader.
I did a little research, and it seems that you can't change the shader using Ringo's tools.😅