Lulu, who also goes by Ruru, favors Gothic Lolita attire. She maintains a cynical and sullen outlook, rigidly sorting everything into "likes" or "hates." She declares preferences such as "I really like cute clothing" and "I like heights," while voicing intense dislikes including "I hate people," "I really hate loud people," and "I absolutely hate gifts."

Her background suggests emotional detachment and emptiness, linked to perceived parental neglect after her unconventional behavior was dismissed as "weird." This history of feeling misunderstood fuels her withdrawn nature.

Meeting Nina sparks unusual initiative in Lulu; she immediately asks Nina to help her explore deeper parts of herself, bypassing her typical reluctance to engage. This triggers a transformative fantasy where Lulu appears as a Gothic Lolita figure wielding an umbrella tipped with a zipper. In this vision, she zips up an entire pastel cityscape—buildings, people, animals, and even the sky—symbolizing a drive to reshape her environment.

Her development involves examining past memories and experiences, though the specifics of her growth or resolution remain undefined.