How would you make this effect on an NPC/Player/Model with a Humanoid?

(Sorry if it’s not the right category but it’s about meshes and the character’s look… so yea, I hope it’s the right one).
You can write your topic however you want, but you need to answer these questions:

  1. What do you want to achieve? Keep it simple and clear!
    I’m trying to understand how to obtain an effect like shown in the picture.
  2. What is the issue? Include screenshots / videos if possible!
    Well, I thought about changing materials, but material doesn’t work with the current Head mesh, and i’m not really sure how to replace the head without it falling from the character.
  3. What solutions have you tried so far? Did you look for solutions on the Developer Hub?
    As I said, I tried changing materials but they don’t work with the head, then I made the head become a meshpart, but it falls from the character and doesn’t remain attached.

This is the effect:
Cattura
Any help/tips is appreciated!

I’ve encountered this before,

Not sure if it’ll help but if you select the head’s special mesh, you can see that the MeshId is a roblox default mesh. Try publishing it as a new mesh, use the id, use no texture and change the material.

If that doesn’t work, try and change the mesh type from SpecialMesh to a regular mesh.

I actually tried it already, as you can see here, I published the Head mesh and put it into a MeshPart:

It gives the same result as a default head, and it’s even glitched. I don’t understand why they don’t let the player change material to parts with meshes.


^^ material is set to Neon ^^

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I’ve seen it used in scripts before like for instance, Rainbow Infinite V9, and these don’t use a special head mesh or anything. They literally just set the head material to “Neon”. It’s weird. The only way to make it work without doing anything is to remove the Humanoid or to remove the BodyColor. (Not sure tho)