In the anime world, there are countless characters with immensely formidable and terrifying powers. However, only a few achieve the level of 'supremacy' where they remain undefeated.
In anime, particularly in the shounen genre, main characters often undergo power development. Some battles may result in their defeat, serving as a turning point for them to become stronger. However, there are also characters who never experience defeat throughout their appearances, believed to possess overwhelmingly powerful strength, dominating over all others.
And here are 5 prominent names you need to know.
1. All Might (My Hero Academia)

My Hero Academia is set in a world full of superheroes. There, one superhero stands above all, admired by everyone for many years - All Might. He became the number one superhero due to being the strongest among all heroes and never having been defeated by any villain.
All Might even became the first superhero to defeat All for One, a dangerous villain undefeated for decades. After the battle, All for One was gravely injured and had to hide for years. He later returned at his peak state for a second time but was still defeated by All Might, albeit leaving him injured. Ultimately, All for One perished in prison, while All Might ended his superhero career with a flawless record.
2. Mamoru Takamura (Hajime no Ippo)

Hajime no Ippo is an anime centered around boxing, so most characters are athletes from that field. One of the most famous boxers in the anime is Mamoru Takamura, who is technically just a supporting character but is known as an undefeated fighter. Out of a total of 27 professional matches Takamura participated in his career, he won them all. Meanwhile, the main character Ippo Makunouchi in this anime suffered three losses out of a total of 26 matches.
Takamura's presence as an undefeated boxer is crucial to the storyline. He represents the ideal of a 'perfect boxer,' serving as an inspiration for Ippo to become an even greater fighter.
3. Koro Sensei (Assassination Classroom)

Koro Sensei poses a danger to the world's safety due to his various immensely powerful abilities capable of destroying the Earth in an instant. Despite his power, he genuinely desires to become the teacher of Class 3-E at Kunugigaoka School. Koro Sensei also trains his students in various ways, offering a 10 million yen reward to anyone who can assassinate him.
Throughout the series, all students from class 3-E constantly attempt to kill Koro Sensei in various ways. Not only the students, but also a plethora of professional assassins from around the world join in attempting to kill this creature to gain a huge sum of money. However, none of their plans succeed.
Indeed, at the end of the anime, Koro Sensei is believed to have died after being killed by his own students. However, this act was intentionally carried out by Koro Sensei because if he wasn't killed, the Earth where his beloved students reside would be destroyed. Therefore, it could be said that Koro Sensei deliberately lost rather than being defeated.
4. Shigeo Kageyama (Mob Psycho 100)

Shigeo Kageyama, also known as Mob, is the main character of the anime Mob Psycho 100. Despite still being a middle school student and having a somewhat timid appearance, Mob truly possesses extraordinary abilities. This is because behind his weak physical abilities, Mob actually has extraordinary psychic powers.
These powers continue to develop throughout the anime and grant Mob various abilities. Starting from telekinesis, energy absorption, astral projection, spiritual awareness, psychic projection, and many others continue to increase as his emotions develop. This also enables Mob to navigate through encounters with every character in the anime without ever experiencing defeat.
5. Saitama (One Punch Man)

Initially, Saitama was just an ordinary office worker. However, after an incident, he became the most powerful entity in the anime. This is because Saitama possesses tremendous superpowers that enable him to defeat any type of enemy with just one punch.
His strength is acquired through rigorous training that a human can truly achieve. He does this daily without rest. Since then, he has become the strongest individual that no one can defeat. Even in a battle against the strongest enemies, Saitama emerges victorious without a scratch. Until now in reality, there is no worthy opponent who can defeat him, which somewhat leaves Saitama feeling bored.