How do I Change colours in specific places

Hello fellows, so let's cut to the chase.. i want to make my character if he's inside a circle his whole sprite that's inside the circle changes to black

Example i made in photoshop:

Thanks for helping in advance.

Could use the 'Set color' effect. Or have a black animation frame and switch to that.

Edit: wait, you said 'the whole sprite' but do you mean just the overlapping part?

Yeah i meant the overlapping part, like if he's half inside the circle and half outside the part of the circle inside is black and so that part in the player... it's complicated.