Timeless Hero: Kamen Rider Zi-O in the MCU

Chapter 1: The timeless Watcher



### Chapter 1: The Timeless Watcher

The skies above New York City were torn asunder. Chitauri warships descended like locusts, their engines roaring as they unleashed chaos upon the streets. Civilians screamed, running for cover as debris rained down from crumbling buildings. Amid the chaos, a young man in his early twenties stood calmly on a rooftop, his hands in his pockets. His name was **Kaito Tachibana**, a reincarnated soul who had once lived a life in another world, now reborn with the mastered powers of **Kamen Rider ZI-O**. He watched the battle unfold with a mix of curiosity and resolve, his sharp eyes scanning the horizon.

Kaito had been in this world for years, quietly observing its heroes and villains. He had no desire for fame or glory; his only goal was to protect the life he had built here. He had a family now—a kind adoptive mother who ran a small bookstore in Queens and a younger sister who looked up to him as her hero. To the world, he was just an ordinary college student studying history. But beneath the surface, he was a guardian of time itself, wielding the power of the **ZI-O Driver** and the **Ridewatches**.

As the Chitauri continued their assault, Kaito sighed. "I guess I can't just stand by and watch," he muttered to himself. He reached into his jacket and pulled out a sleek, futuristic device—the ZI-O Driver. With a flick of his wrist, he activated it, the holographic display glowing with a soft blue light. He selected the **ZI-O Ridewatch** and pressed the button, the familiar voice of the device echoing in his ears.

***"Rider Time! Kamen Rider ZI-O!"***

In a flash of light, Kaito transformed. His body was encased in a sleek, black-and-pink armor adorned with clock-like designs, a crown-shaped visor glowing on his helmet. He felt the surge of power coursing through him, the mastery of time itself at his fingertips. But he didn't rush into battle. Instead, he took a moment to assess the situation, his calm demeanor unwavering.

From his vantage point, he spotted the Avengers—Iron Man, Captain America, Thor, Hulk, Black Widow, and Hawkeye—fighting valiantly against the alien invaders. Kaito admired their teamwork but knew they were spread too thin. Civilians were still in danger, and the Chitauri were relentless. He decided to focus on protecting the innocent, leaving the Avengers to handle the larger threats.

With a burst of speed, Kaito leaped from the rooftop, landing gracefully on the street below. A group of Chitauri soldiers turned their weapons toward him, but before they could fire, he activated the **Time Break** ability. Time slowed to a crawl around him, the world turning monochrome as he moved effortlessly through the frozen chaos. With precise strikes, he dismantled the soldiers' weapons and incapacitated them, all within the span of a single second.

As time resumed, the Chitauri collapsed, their bodies sparking from the damage. Kaito didn't linger; he moved swiftly through the streets, using his powers to shield civilians and guide them to safety. He didn't seek recognition or thanks—his actions were silent and efficient, a shadow in the chaos.

Meanwhile, on the other side of the city, Tony Stark noticed something unusual on his HUD. "JARVIS, what's that energy signature?" he asked, his voice tinged with curiosity.

"An unknown energy source, sir," JARVIS replied. "It appears to be localized near 42nd Street."

Tony frowned. "Another player? Great. Just what we need."

Kaito continued his efforts, his movements fluid and precise. He encountered a group of civilians trapped under rubble, their cries for help barely audible over the din of battle. Without hesitation, he activated the **Build Ridewatch**, his armor shifting to incorporate the powers of Kamen Rider Build. With enhanced strength, he lifted the debris effortlessly, freeing the trapped individuals.

***"Build Armor! Best Match!"***

As he helped the civilians to their feet, a young girl looked up at him with wide eyes. "Are you one of the Avengers?" she asked.

Kaito chuckled softly, his voice modulated by his helmet. "No, just someone who wants to help. Stay safe, okay?" He gave her a gentle pat on the head before vanishing in a blur of motion.

The battle raged on, and Kaito's presence did not go unnoticed. Natasha Romanoff, perched on a nearby rooftop, observed him through her binoculars. "We've got a new guy down there," she reported over the comms. "He's fast, strong, and taking out Chitauri like it's nothing."

"Friend or foe?" Steve Rogers asked, his shield deflecting a blast.

"Hard to say," Natasha replied. "But he's helping civilians. That's good enough for me."

Kaito's next stop was a collapsing bridge, where a school bus full of children was teetering on the edge. Without hesitation, he activated the **Geiz Ridewatch**, his armor shifting to incorporate the powers of Kamen Rider Geiz. With enhanced speed, he raced to the bus, stabilizing it with a burst of energy before guiding it to safety.

***"Geiz Armor! Time Explosion!"***

As the children cheered and thanked him, Kaito felt a pang of warmth in his chest. This was why he fought—to protect the innocent, to ensure that families could stay together. He thought of his own sister, safe at home, and his resolve hardened. No matter the cost, he would keep this world safe.

The battle reached its climax as the Avengers closed the portal, ending the Chitauri invasion. Kaito watched from a distance as the heroes regrouped, their exhaustion evident. He considered introducing himself but decided against it. His powers were too dangerous to reveal openly, and he couldn't risk drawing attention to his family.

As the dust settled, Kaito deactivated his transformation, the ZI-O Driver disappearing into his jacket. He blended back into the crowd, just another face among the survivors. But his actions had not gone unnoticed. SHIELD would soon take an interest in the mysterious figure who had appeared during the battle, and Kaito knew his quiet life was about to change.

That evening, Kaito returned home to his family's small apartment above the bookstore. His sister, **Emi**, rushed to greet him, her face filled with relief. "Kaito! You're okay!" she exclaimed, hugging him tightly.

"Of course I am," he replied, ruffling her hair. "I told you I'd be back, didn't I?"

Their mother, **Yukiko**, emerged from the kitchen, her expression a mix of worry and relief. "The news said the battle was terrible," she said. "I'm just glad you're safe."

Kaito smiled warmly. "I'm fine, Mom. Don't worry about me."

As they sat down for dinner, Kaito couldn't help but feel a sense of unease. The Battle of New York had been a turning point, not just for the world but for him as well. He knew that greater threats were coming, and he would need to be ready. But for now, he focused on the moment, savoring the warmth of his family.

Later that night, Kaito stood on the rooftop of their building, gazing at the stars. He thought about the Avengers, about the responsibility they carried. He respected them, but he also knew that his path was different. He wasn't a hero in the traditional sense—he was a guardian, a protector of time itself.

As he pondered his next steps, a familiar voice echoed in his mind. It was the voice of **Woz**, his loyal retainer from his past life. Though Woz had not yet appeared in this world, Kaito could still feel his presence, a reminder of the legacy he carried.

***"My overlord, the future is in your hands,"*** the voice whispered.

Kaito nodded. "I know," he said softly. "And I won't let anyone take it away."

The next few days were quiet, but Kaito knew it was only the calm before the storm. He continued his studies, spending time with his family, and training in secret to master his powers. He also kept a close eye on the news, watching as the world reacted to the emergence of the Avengers.

One evening, as he walked home from the library, Kaito sensed someone following him. He remained calm, his training kicking in as he led his pursuer into a secluded alley. When he turned around, he found himself face-to-face with **Nick Fury**, the director of SHIELD.

"Kaito Tachibana," Fury said, his one eye narrowing. "We need to talk."

Kaito's mind raced, but he kept his expression neutral. "About what?" he asked, feigning ignorance.

"Don't play dumb," Fury replied. "We saw what you did during the battle. You're not just some college student. Who are you, really?"

Kaito hesitated. He knew this moment would come eventually, but he wasn't ready to reveal his true identity. Not yet. "I'm just someone who wants to help," he said finally. "That's all you need to know."

Fury studied him for a moment before nodding. "Fair enough. But if you're going to keep fighting, you're going to need allies. Think about it."

As Fury walked away, Kaito let out a breath he didn't realize he was holding. He knew his life was about to become much more complicated, but he also knew he couldn't do this alone. For now, he would continue to protect his family and the world from the shadows, but the time would come when he would need to step into the light. And when that day arrived, he would be ready.

---

This chapter sets the stage for Kaito's journey in the MCU, blending his personal struggles with the larger narrative of the Marvel universe. The slow pace allows for character development and world-building, while the action and mystery keep the story engaging. Future chapters will explore his relationships, his growing role in the MCU, and the challenges he faces as a guardian of time.

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