Light based 2d game

Hello everyone, im making a game school project where your character and enemies dont appear, only when they are under a light. How can I make this work? So that when they are in the darkness, they dont have a sprite, but when light hits them, their sprites appear too. It could be really easy but my school doenst teach programming very well and I don`t have a lot of time to learn in so little time. If someone is also capable of helping me in other stuff about this project, we can talk in private, it would be really helpfull, thanks.

Sorry for my english.

Easy Unity - Manual: Sprite Masks just set the character and enemies spriteRenderers to “visable outside maslk” then put the mask on your light