Black (黒ブラック Burakku?):[5] Shihai's Quirk allows him to merge his body into anything dark in color, whether naturally dark or dark via external circumstances, such as shadows.

With further training, he can now move said black things upon possession, although this is limited to entities that are typically capable of moving. As such, he could merge into Fumikage's Dark Shadow and briefly take control of it to attack Fumikage.