How do I make my avatar glow? - Slymeball/figura-faq GitHub Wiki

A special texture can be added to your avatar to make some areas emissive. To make an emissive texture, make a copy of your original texture, open an image editor, remove all pixels that you do NOT want to glow, and save the new file with the name texture_emission.png.

Since the rewrite uses the textures inside of the BlockBench model, you must specify an emissive texture inside of BlockBench instead of the avatar folder.