The world of anime has seen a surge in popularity in recent years, with many classic series being revived and new series being created. But which anime has the biggest fan base? While there are many contenders, the most popular series of all time is undoubtedly One Piece.

One Piece is a Japanese manga series written and illustrated by Eiichiro Oda. It follows the adventures of Monkey D. Luffy, a young man whose body has gained the properties of rubber after eating a Devil Fruit. Luffy and his pirate crew travel the world in search of the legendary treasure known as the One Piece.

The series has been running since 1997 and has become one of the most popular anime series of all time. It has spawned numerous spin-offs, video games, and even a live-action movie. It has also been adapted into an anime series, which has been running since 1999.

Naruto is another popular anime series that has a large fan base. The series follows the adventures of Naruto Uzumaki, a young ninja who dreams of becoming the Hokage, the leader of his village. The series has been running since 2002 and has spawned numerous spin-offs, video games, and even a live-action movie.

Dragon Ball is another classic anime series that has a large fan base. The series follows the adventures of Son Goku, a young martial artist who is on a quest to find the seven Dragon Balls. The series has been running since 1986 and has spawned numerous spin-offs, video games, and even a live-action movie.

Jujutsu Kaisen is a relatively new anime series that has gained a large fan base in a short amount of time. The series follows the adventures of Yuji Itadori, a high school student who has the ability to absorb curses. The series has been running since 2020 and has already spawned numerous spin-offs, video games, and even a live-action movie.

Demon Slayer is another popular anime series that has a large fan base. The series follows the adventures of Tanjiro Kamado, a young swordsman who is on a quest to avenge his family. The series has been running since 2019 and has spawned numerous spin-offs, video games, and even a live-action movie.

Tokyo Revengers is a relatively new anime series that has gained a large fan base in a short amount of time. The series follows the adventures of Takemichi Hanagaki, a young man who travels back in time to save his former girlfriend. The series has been running since 2021 and has already spawned numerous spin-offs, video games, and even a live-action movie.

Comics are also a popular form of entertainment and have a large fan base. There are many popular comic book series, such as Batman, Spider-Man, and X-Men, that have been adapted into movies, TV shows, and video games.

As of 13-May-2023, it is clear that One Piece is the anime series with the biggest fan base. The series has been running for over two decades and has spawned numerous spin-offs, video games, and even a live-action movie. It has also been adapted into an anime series, which has been running since 1999.

It is no surprise that One Piece has such a large fan base. The series has a compelling story, engaging characters, and amazing artwork. It is also one of the longest-running anime series, which means that fans have had plenty of time to get invested in the story and characters.

In conclusion, One Piece is the anime series with the biggest fan base. It has been running for over two decades and has spawned numerous spin-offs, video games, and even a live-action movie. The series has a compelling story, engaging characters, and amazing artwork, which has kept fans invested for so long.