Jun Hiiragi

Keiichi's younger brother. Appears in ~Kurukuru Shuffle!~ and replaces his brother as Kuromi's source for the Dark Power. Jun has a crush on Uta but is rejected several times. He is constantly taunting his older brother, making Keiichi direct his anger at Jun. This causes Jun to become very depressed and angry, which results in Dar-chan taking over his conscious.

(Source: Wikipedia)