Izuku Midoriya with the "Solar Empowerment" Quirk would have a drastically different journey in the world of My Hero Academia. Here's how his life and the story might unfold:

Early Childhood (Ages 4-6)

- Discovery of Quirk: At age 4, Izuku's Quirk is diagnosed as "Quirkless" by doctors because his abilities are dormant and hidden, activated only by exposure to sunlight and storage of solar energy in one's cells.

- Enhanced Vision and Hearing (Age 6): Izuku begins to notice his superhuman vision and hearing, but he keeps it a secret, fearing that he might be labeled as different. His ability to see through objects and hear distant sounds gives him an edge in everyday life, but it also overwhelms him at times, especially in noisy environments.

Elementary School (Ages 7-10)

- Super Breath (Age 8): By age 8, Izuku develops the ability to exhale powerful gusts of wind. He learns to control this power to avoid accidentally harming others, but he starts to realize that he might not be Quirkless after all. Despite this, he keeps his abilities hidden, afraid of how others might react.

- Regeneration: Since birth, Izuku's body has been regenerating from minor injuries at an accelerated rate. He often wonders why he heals faster than others but attributes it to good luck rather than a Quirk.

Middle School (Ages 11-13)

- Invulnerability (Age 12): At age 12, Izuku becomes nearly invulnerable, realizing he can withstand extreme impacts and dangerous situations. This newfound resilience gives him the confidence to start thinking about becoming a hero, even though he's still officially "Quirkless."

- Super Strength and Super Speed (Age 13): By age 13, Izuku's strength and speed reach superhuman levels. He can lift entire buildings and move faster than the speed of sound. With these powers, he begins training in secret, using them to help others in small, unnoticed ways.

High School (Ages 14-16)

- Flight (Age 14): Izuku discovers his ability to fly, allowing him to soar through the skies at incredible speeds. This ability further fuels his dream of becoming a hero, and he starts practicing flight in isolated areas to avoid being seen.

- UA Entrance Exam: With his Quirk now fully developed, Izuku aces the UA High School entrance exam, showcasing his unbelievable powers while still keeping the full extent of his abilities hidden. The examiners are shocked by his strength, speed, and invulnerability, though they still don't fully understand the source of his powers.

Hero Training and UA High School

- Training with All Might: Although Izuku doesn't receive One For All, All Might still takes an interest in him. Recognizing the potential in Izuku, All Might becomes his mentor, helping him master his Quirk and control the vast power he wields.

- Sunlight Dependency: Izuku quickly learns that his powers are dependent on sunlight. During nighttime or extended periods without sunlight, his powers weaken, making him vulnerable. This dependency becomes a critical weakness that he must manage, often seeking sunlight or finding creative ways to store solar energy for emergencies.

- Red Sun Weakness: During a mission, Izuku encounters a situation where his powers are significantly reduced due to an artificial red sun environment created by a villain. This experience teaches him the importance of strategy and relying on his intellect and tactical thinking when his powers aren't at their peak.

Later Developments

- Balancing Power and Responsibility: With his immense power, Izuku grapples with the responsibility that comes with it. His journey becomes one of learning how to use his abilities wisely, avoiding unnecessary harm, and always considering the impact of his actions on others.

- Public Perception: As Izuku's true powers begin to manifest in more public scenarios, his abilities stun the world. The revelation that the "Quirkless" boy has one of the most powerful Quirks ever seen shocks society, and Izuku becomes a symbol of hope for those who were also thought to be powerless.

- Rivalry with Bakugo: Bakugo's rivalry with Izuku takes on a new dimension, as Bakugo now has to contend with a peer whose power eclipses his own. This rivalry pushes both of them to new heights, with Bakugo driven to prove his worth despite Izuku's overwhelming strength.

- Villain Interest: Izuku's powers attract the attention of powerful villains, who see him as a threat to their plans. Some villains may seek to exploit his weakness to sunlight or try to create environments where his powers are diminished.

Conclusion

Izuku's journey with the "Solar Empowerment" Quirk would be one of learning to balance immense power with humility and responsibility. His path to becoming the world's greatest hero would involve not just physical battles, but also the internal struggle of living up to the expectations placed on someone with such extraordinary abilities. So in summary:

In this alternate version of My Hero Academia, Izuku Midoriya is born with the Quirk "Solar Empowerment," which allows him to absorb and metabolize solar energy, granting him superhuman abilities. However, his powers remain hidden, leading him to be mistakenly classified as "Quirkless." As he grows older, Izuku gradually discovers his abilities, including super strength, invulnerability, super speed, flight, enhanced vision and hearing, super breath, and rapid regeneration. These powers emerge as he matures, making him one of the most powerful beings on the planet, though they rely on constant exposure to sunlight.

Izuku's journey follows his struggle to keep his abilities secret while yearning to become a hero. He trains in secret and eventually enters UA High School, where he catches the attention of All Might, who becomes his mentor. Throughout his hero training, Izuku learns to manage the dependency on sunlight, the potential dangers of his overwhelming power, and the responsibility that comes with it.

As Izuku's true potential becomes known, he faces challenges from powerful villains who see him as a threat, and his rivalry with Bakugo intensifies as they push each other to new heights. Izuku's path is marked by his quest to balance his immense power with humility and responsibility, all while proving that even someone once deemed powerless can become the greatest hero.