She's incontinent

Nora Valkyrie was someone who always seemed to be young at heart, and that was true in more ways than one.

Nora was born with a condition that made it impossible to even try to control her bladder and bowels, which made her very undesirable among her parents, who hated having to change her diapers even when she was almost eight years old. Eventually, they abandoned her, so Nora was **** to fend for herself on the streets. During a Grimm attack, she was saved by a kind boy named Ren, who had also lost his parents, so the two started to travel together. Ren never judged Nora for needing to wear diapers or her weird attitude, and Nora always did everything she could to cheer Ren up if he got upset. Years later, they both applied to Beacon Academy to train to become heroes to stop other kids from losing their parents like they did.

The day after orientation, Nora was the first to wake up, and quickly woke Ren up as well. "Morning, sleepyhead!" Nora grinned as Ren got up and noticed a familiar smell coming from her.

"I take it you need a change?" Ren asked with a smirk, causing Nora to nod with a sheepish smile on her face.

Ren took Nora to a private area and unfolded her changing mat, gesturing to it for Nora to lay down on, which she did. Ren untaped Nora's messy diaper and started wiping her down, unfazed by the smell. Nora was actually very stubborn about who she would let change her, and would always ask Ren to do the work for her if he had the chance. There was one time at their previous school where Ren fell ill, and Nora refused to let anyone else change her until he recovered, to the point where she was close to having a blowout. After the hard part was over, Ren applied a liberal amount of baby powder to Nora's rear before taking out another thick diaper with pink unicorn prints on it, and changed her into it. Nora smiled as she got up, admiring her new diaper.