Ruri Gokou, known by her online alias 'Kuroneko', is a significant character in the anime series 'Ore no Imouto ga Konna ni Kawaii Wake ga Nai'. She is a high school student with a passion for the otaku lifestyle, particularly fantasy and gothic elements, which is reflected in her unique fashion sense. Ruri is an intelligent and sharp-tongued girl who often appears stoic, but she deeply cares for her friends. Throughout the series, she becomes a close ally and friend to the protagonist, Kirino, and her brother, Kyousuke, playing a pivotal role in their social circle and personal growth.