Name: Yamamoto Ryuusei Yuki/Aizen Anei
Age: ??? looks about 14-15
Hair Color: Light Blue
Eye Color: Dark Blue
Zanpaktous: Shirotsuki (White Moon - activated by the command, shine), Kurotaiyou (Black Sun - activated by the command, cover everything in your hell), Kyoujinkaji (Lunatic Fire - activated by the command, light the heavens), Kaensanmittai (Flame Trinity - activated by the command, shroud the skies in everlasting darkness)
Bankais: Shirotsuki Joukai (White Moon Heaven), Kurotaiyou Jigoku (Black Sun Hell), Kyoujinkaji Seika (Sacred Song, Lunatic Fire), Kokushibyou Kaensanmittai (Black Death, Flame Trinity)
Family: Yamamoto Genryuusei Shigekuni (Adopted Grandfather), Aizen Sousuke (Older Brother)
Personality:Yuki is usually a free-spirited girl who does whatever she wants. She loves to fight and teasing others - especially a certain 10th division captain. Yuki hates having people worrying about her so she becomes reckless at times. She doesn't like being watched over all the time and hates it when other people underestimate her. Whenever she becomes quiet, Yuki is usually worried about something or is thinking. She doesn't become serious most of the times but when she does, Yuki doesn't take things lightly. The same goes for her when she becomes angry. Yuki doesn't like to involve other people into her problems and would do anything to accomplish her goal - even if it means betraying her friends and family.
History:Yamamoto Ryuusei Yuki is the adopted granddaughter of the General-Captain, Yamamoto Genryuusai Shigekuni. She was abandoned at a young age and did anything to survive on the streets. She grew up on the 1st District of Rukongai and befriended Hitsugaya Toushirou. Yuki had no idea where she came from when she died in the human world and doesn't remember anything from the point she woke up in Rukongai. Yuki and Toushirou were close friends and grew up with each other until she was adopted by the General-Captain. Because she had no idea where she came from, Yamamoto convinced her that she was truly his granddaughter. She accepted it without any argument and went along with it. However, as Yamamoto soon found out when Yuki entered the Academy, she was a genius and had the highest scores besides Hitsugaya Toushirou. She was a prodigy and so, he allowed her to graduate early along with Hitsugaya. Yuki obtained her zanpaktou when she was fighting Kusaka Soujirou and to everyone's surprise, she obtained two zanpaktous. Her element is Light and Darkness which reflected her past and present in many ways. When she graduated, Yamamoto immediately placed Yuki into the Second Division, under Shihouin Yoruichi's command. There, she met Soifon who had declared to be Yuki's rival much to her surprise. Yuki enjoyed the challenge though and the two became the best of rivals and friends. However, when Yoruichi left, Yuki was placed in the 13th Division as the vice-captain when Shiba Kaien died.
It wasn't until when Yuki met Aizen for the first time that she regained all of her memories. However, she kept the truth to herself since she was afraid what Yamamoto would say if he knew that she found out who she really was. For years, Yuki had done her job as the vice-captain and still teased Hitsugaya a lot, including Kuchiki Byakuya. Yuki and Byakuya were also very close and the two of them would usually train together while using shunpo to increase their speed. When Kuchiki Rukia went to Karakura Town, Yuki immediately began to suspect Ichimaru and Aizen. Yuki hates the two captains and everyone in Seireitei knows it.
Yuki knows much about the Sauda Clan, a noble clan that had been exiled for leaving Soul Society. She was close to Kyoshirou who helped trained her with her zanpaktous. She was one of the only people who knew the true power of Kyoshirou's zanpaktou and it didn't surprise her when his daughter, Sauda Akai, had the same power as him. She immediately became friends with Akai and the two of them are close; if only because of Yuki's relationship with the Sauda Clan.
When Aizen betrayed Soul Society, Yuki had immediately began to plan how to get the Hyougoku back. True enough, when Naito came to attack the Sauda manor, Yuki began to use her true name, Anei, and betrayed Soul Society by defeating her boyfriend and fellow captain, Hitsugaya Toushirou. (She became the 5th Division captain after Aizen left).
In Hueco Mundo, Yuki trained until her zanpaktous began to evolve into different forms. Shirotsuki evolved into Kyoujinkaji and Kurotaiyou evolved into Kaensanmittai. With Kyoujinkaji, Yuki was able to control water/ice and have them form into flames. The element is still light but the light manipulates other elements in the air. Kaensanmittai is able to control fire/wind and would form tornadoes. Its element is darkness but like Kyoujinkai, it can manipulate other elements.