So for some of the characters you will either be meeting them for the first time by you joining the squad or you will be meeting them again after years

Byakuya kuchiki - you met again
You and byakuya are both from noble clans and were childhood friends in your younger years, always hanging out, and training together, even went to the soul academy with him too. But after a while you stopped coming over to the soul society and to the kuchiki mansion. When you heard bya had become the head of the kuchiki clan and had gotten married and was happy so you gave up and moved on.

(57 years later) you came back to the soul society to see everyone again. You missed the them even your grandfather who is the Head captain. After you let the division one you went to see everyone, you bumped into a girl that kinda of looked like bya and well know that was his daughter or some thing but when she said that she was his younger sister. You were confused and so she took you back to the kuchiki mansion you and her were outside his office.

She knock on the door of the office "older brother someone is here to see you" she said to him "come in rukia" he said to her. You went in with her "who is it that wants to see me... Y/n is that you?" he asked you "yeah it's me bya" you said to him with an awkward laugh. He took no hesitation and ran to you and hugged you "brother who is this?" rukia asked him "sorry rukia this is my child hood friend y/n" he said to her he still hugging you.

You smiled at her "hi I'm y/n Yamamoto's it's a pleasure to met you" you said to her with a smile "I'm rukia kuchiki it's nice to you wait yamamoto your related to the head captain how?" she asked you "oh he is my grand dad from my dad's side of the family" you said to her "rukia this is y/n l/n yamamoto from the l/n clan" he said to her "your a noble I'm so, sorry lady y/n" she said to you "it's fine you didn't know so bya I didn't know you had a sister you could of told me about her?" you asked him.

He looked at you, then at his sister "well she isn't my real sister y/n I adopted her as a promise from my first wife" he said to you still hugging tightly afraid that if he let's you go in anyway you would leave like you did 57 years ago. "that's was nice of you to do that for her" you said to him. After taking a few months to get over what just was said to you.

Toshiro hitsugaya - Met for the first time
After finishing the soul academy you got in to the squad 10 and became a soul reaper like your older sister momo hinamori tho you didn't look like at all. When you met his lieutenant rangiku who was passed out on the sofa in his office you heard "Rangiku, get up and stop sleeping on the job" he yelled at her "so how are you?" he asked you "sorry captain I'm y/n hinamori" you said to him bowing your head "hinamori your related to momo from squad 5 lieutenant?" he asked you.

You smiled "yes I'm her younger sister" you said "captain she is cute" Rangiku said to him. After you were introduced to him and the lieutenant and the squad 10. You noticed that he was being a bit cold to you and when you were on your break you heard your sis momo's voice "sis where are you?" she ask/ called out "I'm here sis" you out to her a bit upset in your voice "is everything alright, you sound upset?" she asked you. So you told her everything that had happened and she wasn't happy.

She had a stern talk to with him that just cause you don't look a like doesn't mean they can't still be related. After that Toshiro attitude changed towards you and was nicer to you, which was weird and very awkward well for you that is.

He would giving you assignments with the other squad members to go and get rid of hallows. When you got back to the barracks you were surprised with a picnic for you it was of weird cause its not like he likes you or something I think........

Shuhei hisagi - met for the first time
When you were 5 you had caught a cold and well normally colds would go away in like a week or two if its flue but it never left and it turned into a illness you shortly died from it and your younger brother Ichigo was only 3 at the time. But anyway you had passed over to soul society and lived there until you had become a soul reaper.

You got into squad 9 and became a 3rd seat in the division. You with introduced to the lieutenant Shuhei hisagi and your captain Tosen. Your opinions on the lieutenant were that he was cute. You meet a new friends in the different squads, and your best friends is Rangiku matsumoto the lieutenant from squad 10.

Renji Abari - met for the first time
You are the younger sister of Jushiro Ukitake the captain of squad 12 and is also the 3rd seat and besties with the lieutenant rukia kuchiki. When you were reporting back to your captain what you usually do when you heard the lieutenant rukia talking to a boy outside. You left the captains office and went to see who she was talking to.

You saw a boy with long spiky red hair and black tattoos all of his body. He seemed to be a close friend of rukia. She saw you coming over and smiled. He saw you too and looked away which you dk why. "hey rukia, who is this?" you asked her "this is Renji abari the lieutenant of squad 6" she said to you "oh hi, its a pleasure of you I'm y/n ukitake" you said to him "it's a pleasure to me you to y/n I'm Renji abari" he said to you.