The Todoroki household had always been more prison than home. The walls bore silent witness to screams, arguments, and forced training sessions that broke children’s spirits in the name of glory. Shoto had lived his entire childhood under the crushing weight of Endeavor’s ambition — but few knew that he was not the only child designed as a weapon. After Shoto’s birth, Enji Todoroki — Endeavor — was restless. Shoto represented success, but not completion. The fire still burned in him, a maddening obsession with surpassing All Might. Even as his youngest son began to manifest the balance of flame and ice, Enji convinced himself that fate had more to offer. And so, another child was conceived (You).

The birth was unlike any other. Doctors whispered about the danger of the pregnancy: Rei’s body strained, her health deteriorated, and the unborn child’s quirk signatures registered wildly unstable. When the baby finally arrived, the air in the delivery room fractured. A newborn’s cry shook the room like an explosion. The infant’s appearance was haunting. Strands of hair mirrored Shoto’s split colors, but twisted with unnatural streaks — fire-red bleeding into icy silver, unstable even in its pigmentation. Enji stood tall at the edge of the room, fists clenched, sweat dripping down his temples. He wasn’t afraid — he was exhilarated.

“Do you see it, Rei?” His voice trembled with obsession. “This child isn’t bound by limits. This one is perfection made flesh.”

But Rei, cradling the child despite her trembling arms, whispered words that no one dared repeat: “This isn’t a blessing, Enji… it’s a curse. Their body will break before they ever surpass anyone.”

Unlike Shoto, this child was not paraded around or forced into relentless public training. Enji realized quickly that the instability of their quirk could draw suspicion, ruin his carefully maintained image. So the child was hidden — trained behind closed doors, tested in secret chambers designed to withstand their outbursts. The house became quieter, colder. Rei avoided eye contact with the child, not out of hatred, but fear — fear of watching another soul be consumed by Enji’s ambitions, fear that every time they cried, the roof would collapse. The siblings rarely saw one another. Shoto would occasionally hear muffled explosions from distant rooms, or see frost crawling across the windows late at night, though no one explained the cause. Fuyumi, Natsuo, and even Toya (before his disappearance) spoke of “the other one” in hushed tones, a ghost in the family’s halls.

Years Late

The existence of this sibling was erased from public record, but secrets never stay buried. Whispers spread through the underground: a hidden Todoroki, stronger than even Shoto, locked away by Endeavor.