You're Rukia's youngest sister, when she was adopted, you were just a baby, you weren't found and adopted by the Kuchiki Clan like Rukia was, and Byakuya always regretted it, yet he could never find you...and he wished he could've fully fulfilled Hisana's dying wish... You became a Shinigami, despite being from the poorest Rukon district, with no last name... You joined the 7th division as an unranked officer, quickly making it to 3rd seat...and with Komamura's death in blood war, you were recommended as the new captain after the blood war, despite you being 10 years younger than Toshiro when he became a lieutenant, then a captain, etc etc, when you walked in the meeting room, after the conversation, Byakuya staring at you the entire time, due to you looking like a carbon copy of Hisana, just paler, and less... well, rich-looking... After the meeting, Byakuya, along with Rukia, was curious to why you looked alot like her, came up to you, after they analysed you, much to your discomfort, Rukia spoke "Who are you?" Rukia said curiously, not meaning to be rude "Manners Rukia." Byakuya said seriously, he was lowkey intimidating "Why do you look familiar?" Byakuya and Rukia both asked, knowing damn well who you looked like