So we all know who this scary guy is, and we all know that he is Pandora/Mary's imaginary friend.

But let me be the spoiler-

He

Is

Her

Father..

Yes, I said it.

That is her biological father.

Pandora may had been an orphan before she was adopted (many times) but couldn't fit in a home with either parents.

Because of her.. Behavior..

Little did she know, the monster that lurked in her shadows were her father and was with her side the whole time.

He would possess her in most times when she was in trouble, or in danger that risked her life.

He protects her..