The Renegade Immortal's Change

Naruto sat back in his chair, the glowing screen of his phone casting a soft light on his face. His eyes flicked back and forth as he mentally sifted through a catalog of exercises, evaluating what would be the safest and most effective for someone like Izuku Midoriya, who seemed to be struggling with his body's limitations. With his own vast experience and unique abilities, Naruto had no shortage of knowledge to share.

At 36, Naruto was no longer the reckless young shinobi he had once been. Years of battles, training, and self-discovery had transformed him into a master of not only his own abilities but also the teachings of many great experts from across the multiverse. His clones, endless stamina, and the ability to manipulate time gave him an edge that no one else could match. He had spent what felt like thousands of years in training, mastering techniques at speeds beyond the comprehension of ordinary people. His body, mind, and spirit had evolved to levels most could only dream of.

Naruto smirked as he started typing. "Quite an easy request," he muttered to himself as his fingers flew over the keys. His mind worked with precision as he crafted a detailed, step-by-step workout plan for Izuku. He focused on exercises that could be performed safely by someone who didn't have the same healing abilities or enhanced physiology that Naruto himself possessed.

"Weight training, combat exercises... nothing that would bulk you up too much," Naruto mused aloud as he typed. "We need you agile, strong, and dynamic—not stiff or overly muscular. You'll need to train your core, your flexibility, and build strength in a way that complements your quirk, not overwhelms it."

As he wrote out the instructions, he went into intricate detail, making sure to explain how to gradually build up the intensity of the exercises over time, ensuring that Izuku wouldn't overexert himself and risk injury. Naruto's experience in training under various masters allowed him to offer guidance that could mold someone into a true warrior without the risk of crippling them or pushing them too hard.

However, even as he worked, Naruto couldn't help but hear the grumbling of his partner.

"Do you really think this kid is some hero or something? He looks so fragile and weak. He might just be one of those cosplaying kids that have been popping up these days. Disgusting." Kurama's voice echoed in Naruto's mind, his tone dripping with disdain.

Naruto chuckled, his fingers pausing mid-type as the thought of what Kurama had mentioned flashed through his mind. "Haha, damn, that was hilarious," Naruto said with a grin. The memory of a girl cosplaying as him, doing something absurd in front of a man, instantly surfaced. "People crack me up with the stuff they do when they have too much free time."

Kurama growled, his fur bristling in the soul space. "Forget about it, forget about it, or else you can forget about talking to me. We are over if I hear about it again."

Naruto, ever the one to lighten the mood, laughed even harder. "Chill, bro. I was just kidding. If it's a sore point, I won't talk about it again. You're more important to me than that." He paused, feeling a warmth in his chest as he spoke. He truly did care for Kurama, despite the occasional teasing.

Kurama snorted but didn't respond, disappearing back into the soul space. Naruto could almost feel the annoyance radiating from the fox spirit, but he knew that, deep down, Kurama would be fine. He was just too proud to admit it.

"Even if he isn't a hero yet, that doesn't mean he can't be one," Naruto said, more to himself than to Kurama. "Besides, it's good to be healthy." He looked at the screen again, his thoughts shifting. The phones would only land in the hands of those who were inherently good, those who had the potential to rise above their current limitations.

Naruto finished his message to Izuku with a final piece of advice: "And remember, don't rush the process. Take your time. Build your body up gradually, and you'll see results."

He sent the message and leaned back in his chair, satisfied. As much as Izuku may have seemed fragile or weak in his current state, Naruto knew that the young man had potential—potential to become a great hero, a symbol of hope, and someone who could rise above any challenge.

"Let's see what happens next," Naruto muttered to himself, watching as the phone vibrated with a reply.

Izuku Midoriya stared at his phone, the screen filled with a flood of messages and voice notes from the mysterious "Emperor of Mankind." He blinked in disbelief, scrolling back through the messages. It had barely been thirty seconds since he sent his initial inquiry, yet it felt like the Emperor had been waiting for him.

'Is this person even human, or is their quirk related to speed?' Izuku wondered, his mind racing with the possibilities. How could anyone type or respond so fast? It didn't seem possible.

He went back to the top of the messages and started reading through the responses carefully. What he found was nothing short of extraordinary. The explanations provided by the Emperor were detailed and precise—like something he would expect from a professor or martial arts master.

Each technique was broken down into its fundamental components, and the instructions were laid out clearly, step by step. The Emperor didn't just tell him what exercises to do, but why they were important, what benefits they would provide, and what to watch out for in terms of form and safety. Izuku marveled at the depth of knowledge and the clarity with which it was presented. Even the diet section was thorough—advice on the types of foods to eat, the timing of meals, and how each choice would directly benefit his physical growth.

Izuku felt a sense of awe as he absorbed the information, realizing how much care and effort had gone into crafting this plan. It was as if he had received a personal lesson from an expert. As he continued, he noticed something unexpected: alongside the written instructions, there were also images of the Emperor of Mankind in various poses, demonstrating the correct techniques for the exercises. The pictures were detailed, showing how the body should align in specific movements.

'Why didn't he just send a video?' Izuku wondered, a puzzled expression crossing his face. He clicked on the attachment option, expecting to find a video, but found everything normal—no video files, just the messages and images.

'Guess he might be shy about it, or maybe he thought sending a video would be too troublesome for an unknown person? Or perhaps… he's unable to actually replicate the movements in dynamic motion?' Izuku pondered, a sense of respect growing in him for the Emperor. Despite the lack of video, the Emperor's approach seemed deliberate, intellectual, as if he had studied the physical arts deeply but wasn't necessarily someone who could perform them himself.

The truth of the matter was that the video function wasn't operational between dimensions just yet, and Naruto, despite his vast powers, wasn't entirely accustomed to chatting via phone or sending videos. He was more comfortable with action than with modern communication tools, especially when interacting with someone from another world.

Izuku, feeling deeply grateful for the Emperor's guidance, tapped out a response, still buzzing with excitement. "Thank you for the help, I will be going through this for now. But if you require any help in return, then I will try my best."

The reply came almost instantly: "I don't mind, take your time, and we can talk later. Talking with others is good for your health, so avoid being alone and losing that human feature."

Izuku smiled at the message. It was a simple but profound piece of advice. Even someone as busy and powerful as the Emperor of Mankind understood the importance of connection.

"I appreciate your advice, and I will do my best," Izuku replied, his hands already reaching for a notebook on his desk. He was eager to get started on the exercises and make a plan for himself.

With a thumbs-up emoji accompanying the message, Naruto's presence in the chat seemed to disappear as quickly as it had arrived, but the impact of his words lingered. Izuku couldn't help but feel that he had just received guidance from someone truly extraordinary.

As he opened the notebook and began writing down the steps he'd need to take, his heart raced with determination. He wasn't just going to become strong for himself; he was going to become strong for the people he cared about and the world that needed heroes.

Izuku's heart raced with excitement as he copied down the Emperor's instructions, carefully transcribing each word onto paper, making drawings to clarify the techniques. The detailed explanations and images were so helpful that he felt confident in his ability to follow them. He stuck the schedule on his wall—right above his desk—where he could see it every time he looked up. The first phase of the plan called for 40 minutes of physical training followed by 20 minutes of combat practice, a grueling start for someone as untrained as Izuku.

He paused for a moment, staring at the schedule, wondering if he could really handle this. It seemed far more intense than any physical exercise he'd done before. Most people would struggle to keep up with such a regimen, especially at the start.

But this was Izuku Midoriya—someone who had lived through the toughest trials imaginable. Hard work was second nature to him. He had always given everything to his training, pushing through pain and fatigue. Nothing would stop him from achieving his dreams of becoming a true hero.

"I'll do it," Izuku murmured to himself, determination burning in his eyes. He was ready to take on the challenge, no matter how hard it was.

And so, he began. The first 40 minutes of physical training were brutal. His muscles screamed in protest as he followed the exercises the Emperor had outlined. He had never pushed himself like this before—each motion was more intense than the last. His body trembled, his heart pounded, and sweat poured down his face. Despite the exhaustion, Izuku didn't stop. He pushed through, every fiber of his being focused on finishing what he started.

The combat training was no less challenging. Although he was a beginner, he threw himself into the practice with everything he had. Izuku imagined an opponent in front of him, picturing how he would defend and attack, his body moving through the motions. He could feel the weight of every punch, every block, as he practiced the basic principles of fighting.

The sweat continued to pour, his body begging for a break, but Izuku's willpower burned even brighter. He knew that this wasn't just about building strength—it was about creating the foundation for his future as a hero. It was about being able to protect others, to stand tall in the face of danger. He couldn't stop now.

Finally, after what felt like an eternity, Izuku completed the entire session. His body felt like it was on fire, every muscle aching from the strain, but the sense of accomplishment washed over him. He had done it. He had finished the workout, and he hadn't quit.

Collapsing onto his bed, exhausted but proud, Izuku let out a deep breath. He knew the next day would be full of pain. The soreness would come, but that was just a part of the process. It was proof that he was building something stronger, both inside and out.

But there was something else. Izuku had been carrying the phone with him, and though he had no idea how, he noticed that the aches and pains seemed to fade faster than they should. The lingering soreness was still there, but it wasn't nearly as bad as he expected. His body was healing at a remarkable rate, and he couldn't help but think it had something to do with the phone.

'Does this mean the Emperor's powers are actually in the phone?' Izuku wondered, amazed by the thought. If so, that was incredible. It was as if the Emperor was watching over him, even when they weren't directly communicating. The phone seemed to carry traces of his power, making it easier for Izuku to recover from even the toughest of workouts.

The thought brought a sense of gratitude. Izuku knew that his life had changed in ways he couldn't yet fully understand. A simple exchange, a single conversation with the Emperor of Mankind, had set him on a path toward something greater. He had received knowledge that most people could only dream of, and he was determined to make the most of it.

As the soreness from his training began to subside, Izuku fell into a peaceful sleep, dreaming of the future that now seemed within his grasp. He didn't know exactly where his journey would take him, but he knew one thing for sure—he would become the hero he'd always dreamed of being. And with the Emperor's guidance, nothing could stand in his way.