Aya is a very taciturn man, most of the time he keeps everything to himself. he rarely speaks out his mind. However he is very dependable, he also acts as the leader of the group. Most of the time he is silent. You'll find him always working at the shop ( I observed he liked cleaning the windows hehe XD) rather than flirting with women. He likes to be alone most of the time which leads sometimes to misunderstandings and endangering his life. As much as possible he'll do what he can to protect others although he has a weird way of showing it. You won't see him smiling much either, you'll find him always serious and quiet in a corner. He doesn't really like interacting with other people. Aya is more focused on the health of his sister in coma. He visits her time to time as much as he can. Aya is a calm man but whenever he sees a Takatori his anger overwhelms him. His desire for revenge takes the best out of him.
Past:
Aya lead a normal teenager life before. He lived a peaceful life with his family. His life changes after the death of his family. Ran was his real name but since her sister was bedridden he used her name instead to remind him of her. This started one night as Ran and Aya (his sister) were strolling by the park or something. He even bought her earrings (He wears this one on his left ear). They were really having fun (Ran was smiling!! And he's really cute with his short hair and all *__*) anyways as they went home they saw their house in a mess. His father and mom were lying down, they got poisoned by the gas. He immediately told his sister to run outside. However unluckily, there was a car waiting outside which bumped her sister. Not seeing Ran they thought they annihilated their whole family, these was Takatori's plan (Maybe it has to do something with money). This was the start of his despair. This is also the very reason he joined Weiss, to get revenge.