Dark Shadow

Dark Shadow is a Quirk used by Fumikage Tokoyami.

Description
This Quirk allows Fumikage to host a shadow-like monster within his body. He can freely contract and expand it out of his body. It appears that the shadow-like monster is sentient as it has been seen obeying Fumikage's commands.

The shadow-like monster's power and personality is affected by darkness and light; In darkness, the shadow-like monster becomes much stronger but it becomes unrulier and therefore harder to control. In light (such as sunlight), the shadow-like monster becomes docile and easier to control but its power becomes weaker. Any attack that has light in it (such as Denki's electricity or Katsuki's Explosions) is super effective against the shadow-like monster and will gradually weaken it.

The shadow-like monster has an energy limit and if it runs out of energy, it will not be able to battle and will immediately contract into Fumikage's body.