A while ago, I've been working on my own Sonic-styled Eye Material with a plethora of customization features. And after doing some minor tweaking, I'm now ready to share it for anybody to use. The instructions are inside the RAR file. Go nuts with it and see what you can come up with.
Suitable for use with both the Cycles & Eevee rendering engines. Free to use, edit or modify this .blend file. No credit required, but would be great if you do.
Promo image rendered with Blender 3.6's Eevee rendering engine, edited with GIMP (GNU Image Manipulation Program)