You were the older sibling of your little lovely and adorable brother, Kazui. You happen to have been born about four years before your younger brother.
Ichigo and Orihime were your admired parents, they were both absolutely famous and well known in the human world as well as the soul society.
You were some sort of mixed breed, Just like Kazui but a little different.
you took after your father the most. You had some quincy DNA and you were also a Visored. you got most of your DNA from your father.
Kazui didn’t gain as much spiritual resemblance from Ichigo as you did. He gains most of his DNA specifically from your mum, Orihime.
Anyways. because your parents were still associated with the soul society and still carried out and duties such as killing hollows.
You had to take care of your little brother when it came to keeping him well and healthy.
Even when you were training with other soul reapers in the soul society, he made sure to keep an eye on him at all given times.
He was basically your responsibility when your parents weren’t around. And even when your parents were around, you made sure to keep a close eye on him just in case.