Zeragon — Demon King

Alexander: hero of light.
Current age: 24
Age at which he arrived in the new world: 15
Appearance: Slim without a very toned body, short brown hair, dark brown eyes, and white skin
Power: He is capable of using light as a weapon, creating yellowish light that can take the shape of anything he desires and can be solid light, his main weapon being a sword of light.
Personality: arrogant, extroverted, somewhat misogynistic, sexist, perverted, envious, womanizer, fearful although he hides it with arrogance.

Alexander was the first to undergo the test where the king would determine what power they would have, but he was considered the leader of the group upon receiving a power as strong as light, even though at first he did not know how to use it.

The kingdom of Vertiris found an ancient temple of past heroes where they discovered how to summon legendary heroes, and with that knowledge, their power-hungry ruler used his best mages to perform a ritual that would grant him a formidable group with unimaginable powers.

The day finally arrived and in the other ten court wizards' room they illuminated a magic circle on the floor from which a blinding light shone, followed by a group of teenagers in strange clothes who quickly appeared confused by the place.

When the King saw that they were just children, easy to mold, he told them the story of the demon king and that they were the heroes destined to save humanity from darkness.
Most of the group did not believe that they were now the destiny of humanity, but upon learning that they had unimaginable powers, they accepted the position without hesitation, trusting the king blindly.

For millennia, the legend has existed that when humanity was on the brink of extinction, the supreme god of that world gave them the right to use an innovation spell that would bring forth a group of heroes with formidable abilities to fight against the dark forces.

Time passed and the god was forgotten, becoming a legend where he was a hero from another world who granted the power to bring others, but that spell was lost over time throughout the millennia, as there was a time of peace between humans and demons.

An old tale tells that the war began in time immemorial, when very few humans mastered magic. These few, filled with emissaries of demonic power and strength, decided to attack the castle directly, killing anyone who stood in their way, seeking to destroy the King, who was not in his palace at the time. The humans split up within the castle to search for the King, but a small group found the royal gardens where the Queen resided—a woman with a soft voice and an aura so pure it bordered on the celestial. Not believing that what they had before them was a human, and suspecting it was a trap, they mercilessly killed the Queen, who tried with all her might to escape, but her blood spilled in the garden, staining it with her blood.
When the king learned of the human attack, his soul was corrupted by anger and darkness.

Many say that's just a children's story, but what prevails is mutual hatred. The dispute between humans and demons has persisted for millennia, no matter how much the demon kings changed or were destroyed, because a new one always emerged despite the death of the previous one, feeding their power with human malice and evil. This is the reason why the heroes from another world returned.

This magical world is mainly centered on a large continent that is divided into 5 kingdoms, and then other large islands, half of which belong to demon lands and the rest to beastmen and elves who had a more or less good trade relationship with the demons.

The five main kingdoms are human: the Kingdom of Eristes, a kingdom with considerable military power and maritime territory, where, thanks to its heroes, its borders are free of monsters and demons; the Kingdom of Arquilia, a place where the most overexploited resource is the minerals used to craft high-level magical weapons, and where discrimination against non-human races is rampant; Telimes, a border kingdom composed mainly of mineral-rich valleys and mountains, a land of dragons, currently attempting to establish trade relations with the draconian race for minerals and valuable dragon scales; Varteris, a kingdom that has been at war with demons and elves for centuries, where the buying and selling of slaves and the use of trademarks are still legal; and finally, the maritime kingdom of Peratri, known for its high-quality magical crystals and jewelry made from monster crystals and precious stones.