So I forgot to say, Izuku can use both dark matter and blood control without taking off the ring but it never does because it reminds him of the monster inside him. But, when he is using it and has control, His palms become black and these black and red things start comming up his arms. It looks kinda like when muscular grows his muscles, but it does not compleatly cover his. It kinda goes up to just after his elbow. But, when the monster takes over, aka he takes off the ring, the red and black lines continue to go up his neck and to his face. When The Monster has compleatly taken over, his eyes change. His right eye turns fully black, and left turns fully red.