My Hero Academia Crossover Fanfiction

✅ SYNOPSIS Billy Howell grew up in the modern city of Silver Heights, known by everyone as the unlucky boy who never got anything right. What people didn’t know was that a strange and ancient force had been sealed inside him since birth. That seal kept his energy weak, his senses dull, and his future dim. One day, a mysterious accident awakens the Eternal Origin Core, an ancient treasure buried deep within him. Along with the awakening comes a strange voice— the Origin System, a powerful system containing rewards, tasks, and an exchange store. From that moment, Billy’s life changes forever. He begins to meet people with hidden supernatural abilities, discovers dangerous underground societies, and learns that the world is far from ordinary. But the biggest twist comes when a strange pull drags him into another world entirely—a place where cultivation, magical bloodlines, and ancient clans rule everything. There, Billy realizes a shocking truth: He has lived once in that world before. And now, all the knowledge, instincts, and battle skills from his forgotten past life begin to awaken. With the system guiding him, Billy rises faster than anyone else. Those who once mocked him are forced to watch as he becomes a name that shakes both worlds.

Shortly after the death of his parents, Ash Heartfield got adopted by another family, which led to him being maltreated even during the great apocalypse. The inheritance his late parents left for him slowly got snatched away by them, leaving him to settle for peanuts. Ash later became the last survivor with the skills he gained and was able to survive while everyone he knew, died. After living out his remaining days in solitude, he ended up taking his life but miraculously got reincarnated a month before the apocalypse. Will he be able to protect everyone dear to him with this second chance? Feel free to join my discord server if you want to reach out... https://discord.gg/jFYfRBpk

Saving a crumbling empire from the brink of bankruptcy should have cemented Samuel Hayes as a hero, but instead, it only invited betrayal. To the world, he was just a washed-up nobody, a man too weak to fight back. But when he stepped into the city’s most dangerous den, the facade cracked. Piece by piece, Samuel Hayes unveiled the truth—a force untouchable, unrelenting, and utterly unstoppable.

"If he cannot survive in this Realm and ascend to the Higher Realms, then he is not worthy of being my son!” *** Xiao Tian, the child abandoned by his own parents. He once lived a happy life as the crown prince of the Wang Kingdom. But a great tragedy struck his family—his beloved uncle staged a coup, killing his mother, father, and all those loyal to them. However, the death of his parents was a lie. It was merely a scheme—to leave him behind in the Tianwu Realm, the lowest realm in the Universe. Alone, he rose. Step by step, he walked a path filled with hardship. When he discovered that his parents were still alive, anger filled his heart. But it was not blind rage—it became the fire that forged his resolve to become stronger. With unwavering spirit, he climbed from the lowest realm, ascending through each realm—until he surpassed even his father and became the ruler of the entire Universe! “I, Xiao Tian, swear to overturn this injustice. I will reach immortality and create true peace—so that no one will ever be oppressed again across the Universe. Strength shall no longer be the only measure of justice. And if strength is the key—then I shall become the strongest and be the one who defines justice for all of existence!”

Two painful memories, fragments of personality and habitual bad luck are all that Hero 67665 has left when he enters the new world. He was promised a happy life and a chance to correct his mistakes, but no one said they would help with this. An ideal world filled with losers, scum, and it’s almost impossible to level up. Let's start with the first unit of experience?

Kai Wang died a loser–beaten to death in an underground fight while he watched his girlfriend kiss his killer. Kai gets a second chance at life–but it comes with a price written in blood. Granted by a mysterious system run by seven faceless beings. Now reborn with power he must fight his way back to the top while completing missions for his faceless masters. He must save his dying mother, destroy those who betray him, and become the unstoppable figure no one expected. But every mission pulls him deeper into darkness and one question remains–will he save his soul or lose it chasing power?

Elrick Aldof—A lousy young man whose life is full of misery and failure at all costs, unexpectedly discovers a system that magically has an infinite arsenal, full of various weapons! In the face of the irregularities in his life, he was shocked when the terrible 'Mad Wolf' virus hit Okazaki City overnight. Suddenly, the town where he lived became deserted because there were rampant zombies, and the streets were full of corpses in the form of zombies. How will Elrick Aldof act in facing the system to save his life and the lives of his relatives and close friends?

Richard Cross, born as a bastard, went through many difficulties, but he didn't let that defeat him, being raised with the love of his mother, who kept him going forward. Time passes by, and now he's in his early twenties, with a great paid-off job, a lovely girlfriend. Living his life to the fullest, but it didn't last long... As young and promising as he can be, he lost his life in his own apartment at the hands of an assassin. But not being the end of his journey, he got a second chance to live, and experience the wonders like a Fantasy book But, lucky is not completely on his side, he's born as a bastard again. Nevertheless, he has a power bestowed upon him from birth, and he will make use of it to the fullest. Join Richard's journey to become stronger, to become the KING OF THE UNDEAD.

Joseph Benjamin Carmen, also known as JBC or Unkillable, fused with infinite variants of himself, each representing different versions of his being across the multiverse. This fusion resulted in the creation of a prime version, possessing unimaginable power beyond comprehension. However, this newfound power came at a steep cost: the absorption of so many diverse counterparts triggered what is known as personality madness. To contain this madness and his limitless potential, JBC bears three mystical markings on his forehead, which serve to seal and suppress his powers. JBC is forcibly sent to an isekai world—the last of its kind—by a mysterious and powerful force he encountered after the fusion. In this strange new world, he must undergo a journey of self-discovery to control his ambitions, or risk unleashing chaos and destruction. As he explores this dimension, JBC notices significant changes in himself and his abilities, making him question his purpose. Will he rise as the protector of this new world, or will he become its greatest enemy? Author's Note: To learn about Unkillable's origin, refer to Beyond Dimensions: The Tales of Unkillable - Episode 4. The full story of his origin, along with those of his variants, will be revealed as the story unfolds.

“Luck is not random. It's leverage.” Clay Holmes was the statistical average of mediocrity, a man adrift until a catastrophic, improbable car pile-up, a cosmic anomaly, forced his latent destiny to the surface. Clay survived, not by chance, but by becoming the latest inheritor of the King of War Cycle, a living engine of fate tasked with maintaining the precarious balance of chaos and order in the world. This ascension gifted Clay a terrifying, dual power set. First, Physiological Regression, which allows him to instantly read every historical weakness, old injury, and micro-shift in an opponent’s anatomy, turning every fight into a perfectly choreographed counter-attack rooted in past truth. Second, Probability Bias: the true power of a strategic genius. Clay doesn't need to be stronger or faster; he subtly manipulates every stray variable, a breath, a flicker of light, a loose floor tile, ensuring the 0.01% chance of victory becomes a 100% statistical inevitability. But his awakening triggers a devastating war with the man who came before him. The Predecessor, the former King of War who cracked under the psychological weight of the Debt and the Cycle's constant violence, has returned to finish his mission: end all probability. Convinced that random chance is the source of all human suffering and the guarantor of future devastation, the Predecessor seeks to obliterate the very concept of luck from the world. To stop the Predecessor, Clay must master his terrifying control over luck and anatomy, leading him back to the Nexus Point of his accident for a final, reality-bending confrontation. The stakes are total: if Clay fails, the world ends in rigid, predictable order. If he succeeds, he must transcend his humanity, merging with the combined knowledge of every King before him to become the Consciousness of Possibility, the ultimate defender of human potential.