Title: My Hero Academia: The Shadow Twin
In a world where heroes reign supreme, Izuku Midoriya, now a renowned hero, remained unaware of his twin sister, Oathy Midoriya. Their father, Hisashi Midoriya, had subjected Oathy to inhumane experiments, granting her a twisted version of One For All. With each touch, she permanently copied the Quirks of others, accumulating immense power.
Oathy's existence remained a dark secret, confined to the depths of the villainous organization, "The Shadow Syndicate." Her father's goal was to harness her abilities to dominate the hero society.
As the hero era reached its peak, a sudden surge in villainous activity threatened global peace. Deku, now a respected hero, led the charge against the Shadow Syndicate's stronghold. Unbeknownst to him, Oathy was the key to the villains' power.
During the final battle, Deku's team breached the Syndicate's core, where they found Oathy, her body strained from the countless Quirks she had absorbed. Hisashi Midoriya revealed his sinister plan: Oathy would copy the Quirks of every hero present, granting him unparalleled power.
Determined to stop his father and save his sister, Deku fought to reach Oathy. In a climactic moment, he touched her, and their bond awakened. Oathy, sensing her brother's heart, refused to copy his Quirk, breaking free from her father's control.
Together, the twins turned the tide of the battle, their combined strength defeating the Shadow Syndicate. With Hisashi Midoriya defeated and the villains vanquished, Oathy finally found redemption and a chance to start anew, surrounded by her brother and the hero community.
Blaze Flames
Was amazing,
Was a Hero,
Was alive,
Was the father of Izuku Midoriya, although he was gone, she took him up as an inspiration even dreaming of becoming a hero like he was.
However, hatred, anger and agony got mixxed into a bloody synchronicity as it was revealed that her father did not die in action...
But was murdered by a Hero.
~~~~~~~~
Villain! Fem! Deku plus inheritance quirk AU, in which Deku inherited her mother's quirk.
BTW I changed the date of Deku's bday for the sake of relationship development and for the sake of those dateless events in the manga, altogether I hope you would like it!