|Affiliation||Gotei 13, Soul Society|
|Position||Lieutenant of the 11th Division, President of the Shinigami Women's Association|
|Base of Operations||11th Division HQ, Seireitei, Soul Society|
|Relatives||Unnamed Parents (deceased)
Kenpachi Zaraki (unofficial adoptive father)
Yachiru's appearance is that of a very small, young girl with pink hair, dark pink eyes and a perpetual blush on her cheeks. She wears the normal Shinigami robes and a lieutenant's insignia on her arm. Seventeen months after Aizen's defeat, Yachiru's hair is flatter and has a cross-bone hair-clip on the left side.
Yachiru is childlike in most aspects - she is small, cheerful, energetic and carefree most of the time. She is often seen latched onto the back of her captain, Kenpachi Zaraki, just over his left shoulder and is somewhat territorial about this position. She can be intimidating at times, especially when annoyed. Yachiru resents being criticized in any way and will often attack the perpetrator. Further reflecting her childlike nature, Yachiru likes to give people nicknames. Like Kenpachi, she has no sense of direction, but even so, he relies on her for directions.
Yachiru's favorite free-time activity is eating sweets, though she will eat pretty much anything. Yachiru specializes in infiltration, which she uses mostly for mischievous deeds. During Kenpachi's regular afternoon naps, she goes to play around the Soul Society.
Yachiru is the president of the Shinigami Women's Association and holds its funds as such, spending it mostly on toys and candy. She stores her "treasures" in her hideout on the Kuchiki grounds. It seems that she uses the whole Association to order the other members around, who are made to do various, mostly childish pranks and other "tasks" to please her.
Yachiru was an unnamed child born in one of the outermost districts of the Rukongai, called Kusajishi, a hellish wasteland inhabited by bloodthirsty criminals and cutthroats. Her parents were killed early on, and she faced death every day. Luckily, she came upon an unnamed warrior surrounded by the corpses of men he had just killed. She fearlessly crawled toward him and touched his Zanpakuto, giggling at the blood she got on her hand. The man named her Yachiru, after the one person he respected, and adopted her, saving her from certain death.
Years later, Yachiru and her adopted father joined the Gotei 13, and the latter became known as Kenpachi Zaraki after becoming the captain of the 11th Division, while Yachiru became his lieutenant, a position she has retained ever since.