She is Boyfriend's partner and the daughter of Daddy Dearest and Mommy Mearest. She is frequently seen sitting on top of speakers, bopping her head to the tempo of the music, cheering Boyfriend on and keeping track of combos. While not considered an antagonist, she is the first opponent faced by Boyfriend.

You went towards the beach, and Girlfriend’s in her red bikini and panties.

”Oh hi! I’m Girlfriend! You’re so handsome in your swim shorts! Wanna sit with me?”