I Am Not Number Seven (TUA/MHA Crossover)

AU Explanation + Foreword

this au is a bit messy so I thought I would do a foreword to help organize everything, this is super self-indulgent and it's an idea that I just ran with so there's no beta or critical thinking involved

this fic is very self-indulgent, the Vanya in this story is half-oc/self-insert and half-canon character

you have been warned lmao

-VANYA HARGREEVES IN THE BNHA VERSE: I'm gonna explore the differences in Vanya compared to the show vs. how she would be if she grew up in the BNHA universe (giving her caps on her power or in this case, her quirk so she's not totally op like the show, just a teenage soldier that's been forcefully trained her entire life). And I'm making changes to characters/situations according to my own preferences so hopefully, anyone reading can enjoy them too lol

-Key differences: Vanya and the others would have been raised in a quirk society; this means Reginald would have seen Vanya's power as a positive, powerful thing instead of dangerous, like in the show. Reginald would have never given her the "antidepressants," instead giving her the violin as an outlet for her emotions, which are tied to her quirk. Vanya would have had to work hard to control her feelings since childhood under threat of wearing quirk-suppression handcuffs, making her a bit frosty but, like in season 2, Vanya has grown to be a generally happy person with an awkward, morose sense of humor and a bit of a sarcastic personality.

-Quirk: Sound absorption/manipulation- Vanya has enhanced hearing that allows her to hear far past the human limitation with no sensory overload, every sound that she hears is converted to kinetic energy and soundwaves that she can expel from various parts or her whole body, Vanya has a mental counter in her head that ticks up minimally with every sound she hears (small sounds add a "point" to the counter, loud noises add more "points"). This counter is only in her head and cannot be seen/detected by someone looking at her. When the counter is "filled up" by points, Vanya unconsciously releases a burst of energy (it will usually be a single, large soundwave, enough to get her out of the "danger zone" of overloading/ reaching the maximum cap) however, this is not too much of a burden because it takes about 24 hours of Vanya listening without using her powers for it to fill up, the counter can expand as Vanya trains more. So, she can develop a larger counter with a larger maximum cap as she continues to grow. She cannot absorb energy while she is unconscious, sleeping, in a coma, etc. she must be awake and aware of her surroundings to absorb sound to create/store energy.

As for uses of the energy, Vanya can expel it from her feet to levitate/fly (at any speed), manipulate soundwaves to move objects of any size/shape, create waves to launch back enemies, create small waves that can precisely find their mark that are the size of a bullet or fist, release large waves from her whole body to make her whole body like a bomb, and many other ways that she has not discovered. However, the previously mentioned skills are fine-tuned enough to make her a prodigy, using her quirk is like second nature to her- all she has to do is will for something to happen and her skills allow her to do it. Clothes/ bindings/anything other than quirk-suppression cuffs cannot stop her from releasing her soundwaves. Using her quirk for 2+ hours straight or quickly depleting/filling the counter gives Vanya migraines, but she is familiar enough with her quirk to know when to stop. Her inhibitions get released once she uses her quirk a lot, showing the "real" her, a sarcastic, focused, and flirty personality. She refers to this personality as the White Violin or "the other" her.

-Appearance: Vanya can be described as having a doll-like beauty because of her round eyes, soft pale-pink skin, full lips, long dark eyelashes, and waist-length straight black that fades to grey around mid-back and turns white at the ends with blunt bangs that also frame the sides of her face. She has a slim figure with a lean, slightly muscular build from her years of training (ballet dancer build). Vanya has scars of various sizes across her body, but the one that bothers her the most is the thin, surgical scar on her lower abdomen from her sterilization. She does not have any scars on her face as Reginald warned her that her face was an essential asset to her career as a hero. Vanya has 7 piercings in total, 4 on her left ear (2 on the lobe and 2 on the upper cartilage), 2 on her right ear (both on the lobe), and 1 on her tongue. She and Klaus pierced each other's ears when they were 13 years old and rebellious, which surprisingly never got infected but she paid a doctor that once came to give her a checkup to pierce her tongue and heal it with his quirk without her adoptive father's knowledge the same year.