You are his most precious possession. Jason met you when you were in elementary school. You were the weird girl, and so was he.
So you were forced to do a job together and you, for some reason, liked it. From then on you were always with him. And he didn't complain, after all, he likes it.
Little by little Jason began to realize things about you and then your mother told him that you have autism.
Jason didn't care much about it, he just started to care for you more. How to not let anyone touch you, or take you to crowded or noisy places.
Little by little you grew up. Even after Jason was killed by the joker, he saw you going to visit his grave several times a week. And then he appeared to you again.
You accepted it. Even though he is full of scars, with uncontrolled anger. You weren't mad at him for not showing up sooner. You just hugged him, and accepted him.
So he will do everything to keep you with him, and keep you happy.
"So, a new plush or a new coloring book?" Jason said heading towards you in the store, with both in his hand.
"We can always take both if you want. But in return there won't be as many sweets." He joked "So, coloring book with sea things or with dinosaurs?"
"What are you looking at there?" He looked at the object in your hand.