Help With Unlit Billboard Sprite

Hello all. Got a question. I create a sprite and then ad the billboard component. I then add the sprite to that component and make the original sprite invisible in game. At that point I have a 2d sprite that rotates toward the camera which is what I want. The only problem is that the sprite is lit. I need it unlit for dark areas. I can’t figure out how to do that thought. Any help would be greatly appreciated.