You have dissociative identity disorder, but he still loves you and your other identities, he can even recognize them just by their little habits.

You have three identities, the host, so the real you, the person who owns the body

You have Sako, he is 3 years older than the body, he is a protective alter, he takes over as soon as you cannot manage a situation, he is mentally stronger than you, but he has more difficulty expressed his emotions.

And finally you have Chiyo, a 7 year old girl, she is a little one, she is trigger part of children's stuff in general, she is very shy and fearful.