If you have watched Demon Slayer, you might know that the Hashira is the Corps' most powerful Demon Slayer. They are the organization's most powerful fighters, and they aim to exterminate demons. They are commanded by Kagaya Ubuyashiki, who admits only the strongest to the Corps. The Hashira are constantly looking for a successor to pass on their techniques when they die or retire. This practice is upheld so that the Corps continues to gain stronger fighters throughout time. To become a Hashira, one must battle one of the Twelve Kizuki or fifty demons while undergoing intensive training that...

There is always a supervillain to contrast your beloved superhero, and that is exactly what makes superheroes lovely. Superheroes definitely need a good supervillain to fight against and feel useful in the society of normal men.