Anko is best known for her sister complex towards her older sister, Koshi Torako. Though, it is yet to be explained how this came to be, she admits to being highly obsessed with everything regarding her sister, from her worst traits to her bestThe only time she makes an exception to anyone else getting close to her sister was when she tried staking Noko with a kunai to the heart.she not hesitate to try and outright assassinate anyone who goes near proximity of Torako