五更 瑠璃

Kuroneko (a.k.a. Gokou Ruri) is one of the anime otaku girls Kirino had met in a gathering organized by Saori. Though their tastes in anime and games greatly differ, they nevertheless began to be good friends. She also became a good friend to Kyousuke, and it is hinted that she may have feelings for him. As befits the Kuroneko epithet, she is usually seen wearing a black Gothic Lolita-style dress, and is sharp-tongued and antisocial.

AniDB