There's A Little Of Me Inside Every Body [FNAF x BNHA][BNHA x Ennard]

(Ennard is already in the BNHA universe, his body is his quirk, I just wanted to let you know so you guys don't get confused.)
.
.
.
Ennard was a very well-known criminal in Japan. In his criminal records, he was just below, AFO. He's a very powerful person/robot. He was extremely hard to catch. He was able to hide in the smallest of places. What the police and heroes later found out was that he could also hide himself in other people's bodies.
When the police and heroes found his base, they all saw corpses all over the building. All the bodies were from missing person cases. Some of these people have been missing for over three years. They never knew that they were killed. The worst thing the police and heroes saw was that there were people who were hung up like trophies on the walls.
When Ennard was finally captured, he wouldn't talk, he would only look at you straight in the eyes and it was creepy to no end. But, one day, a certain hero in training came along and could get a few words out of him.

Who is the person that was able to get Ennard to speak?

Read and find out.