XCAT

Xcat takes the form of a black cat doll, toy, android, or mannequin. Its true form is indeterminant. Xcat's limbs can stretch several times their default (already elongated) length. Xcat always has one eye, which either shows up on the front or side of its head as a generic cat eye, computer screen, or button.

Xcat has the ability to enter a foe's body after inflicting wounds upon them. Once inside, it is able to control the opponent for as long as Xcat's user is conscious. Xcat can also duplicate itself if its user sacrifices the use of both their hands to control the Xcat clone. Xcat's double will usually be in a different form or shape than the original. The double can also control a wounded foe. 

Xcat is currently in a symbiotic relationship with Lucy.