She is a classmate of Josuke's and Koichi's, who has an obsessive crush on Koichi. Her obsession leads to her trying to force him into loving her, effectively resulting in a battle between the two. Later on she gives up forcing him to like her, but uses the power of Aya Tsuji's Stand, which causes her to be unusually attractive to Koichi, resulting a side-story and by the end an actual relationship between them. Her Stand Love Deluxe, named after Love Deluxe, is bound to her hair and can lengthen to any distance.
Araki drew the cover for the 2009 single "Breeeeze Girl" by the rock band Base Ball Bear, it features Yukako in a panel from the manga.