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Underground hero AU
Present Mic is an underground hero. "But Dingus! Mic's loud??? How the fuck???" Within this AU Hizashi heavily focused on changing his quirks frequency range instead of going for the loudest sound he could. This means by the time he graduated, he had it fine tuned- a vocal range from 10 Hz to 30K Hz. Now with this range he can produce sounds that you couldn't hear at all. Pretty useful stealth weapon.
Hizashi in this AU is BOTH pro and underground. Present Mic being his pro-hero persona (its cause he wanted to be a radio host so bad and he needs an outlet for all his BOMBASTIC energy) and his underground hero self having literally no information on him.
Appearance (I might recycle the actual outfit from the Eraserhead outfit I did a while ago but change a few things cause I love that design sm): Hair tied up in a high ponytail, bandana over his mouth and neck, black tighter fit, defensive padding, reinforced knuckles and boots.
The bandana is there to both hide his identity better and to cover his mouth. This is so that the enemy can't see it open for when he uses his quirk. They don't know that his quirk is Voice. They just know that whenever this new prick is around the effects can vary, like:
Uneasiness
Dizziness
Nausea
Anxiety
Headache
Worse cases involve tinnitus and internal organ damage
But he can also do the opposite, in hostage situations he can help those calm down easily (please listen to the frequency of love) without saying a word. He daren't go any lower than 10 HZ however because 7 HZ is deadly and capable of bursting all organs.
Along with this, he can easily change his voice. Making concealment simple, mimicking easy and intimidation hit hard.