In modern literature, although Byakuya is written as the protagonist, he is not considered the protagonist.
The article style is similar to Horror Pet Shop
It is composed of small stories, and Byakuya is just the character who opens a door for the protagonist of each story.
There won't be Byakuya's CP partner until later.
The Byakuya in this article is the young Byakuya, not the iceberg Byakuya.
I'm not very good at grasping the original image of the characters, so there will be quite a bit of deviation.
Some common sense points may also be unreasonable, please ignore them.