Sprites receive shadows and can have transparency?

Hey,
For my 2D game im making, i can set sprites to use the “Default-Deffuse” Material so they receive shadows, this is great for tiles and such, but when i put this on a sprite that needs some parts transparent (like a player) the transparent parts become visible.
How can i fix this?
Thanks

Try to make material Sprites/Diffuse

Thanks, that worked