Anime with powerful demon lords was popular in the 2000s. These super strong characters solve problems in their worlds easily, without changing much. People like different things in these stories; some characters are vampires or spirits, not just demons.
1. Misfit Of The Demon King Academy

“Misfit of the Demon King Academy” is an anime where the Demon King reincarnates after 2,000 years. He enrolls in a school to prove his identity. With immense power and a unique perspective, he faces challenges and mysteries.
2. Devils And Realist

William, facing poverty due to his uncle’s business failure, accidentally summons a devil named Dantalion. The devil reveals that William must choose a ruler for the demonic world, surprising both William and us.
3. Seven Deadly Sins
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People have different opinions on “SDS.” Animation quality dropped in later seasons. But it has well-written characters and a catchy feeling. Meliodas, a good guy, became Demon King’s successor. He was powerful, second only to Escanor at noon.
4. Overlord

In this game-based isekai, Momonga becomes Overlord in a new world. He was a skilled YGGDRASIL player and got stuck in the game’s world. Now, as an almighty emperor, he enjoys his new life.
5. Blue Exorcist

A Demon King is locked out of the world he wanted to conquer. He sends his son, Rin, as a vessel. Rin lives normally but learns the truth about his dad. He decides to protect his world with his demon powers.
6. The Devil Is A Part-Timer

In a laid-back comedy, Demon Lord Maou leaves his world and ends up in modern Japan with his sidekick. He works at a fast-food place and their life becomes a funny mess. Maou is poor but doesn’t mind. People have different feelings about him.
7. Demon King Daimao

Akuto heads to magic school but is unexpectedly labeled as a future Demon King. He loses friends and confirms his destiny. He attracts women’s attention, some wishing to eliminate him, while others desire his company in this unusual deal.
8. How Not To Summon A Demon Lord

“Strongest Demon Lord” meets catgirls in this anime. Diablo, a video game player, gets summoned by girls but becomes their master. They go on adventures, gaining fame. Diablo faces funny situations and enjoys it, even though he was just a gamer.
9. Black Clover

“Black Clover” is an anime with devils. Asta, the main character, isn’t a devil, but a devil lives in his book, or grimoire. Together, they become strong with anti-magic powers, making Asta and his devil, Liebe, a powerful team.
10. Welcome to Demon School

“Welcome to Demon School” is a fun anime. It’s about a boy named Iruma who goes to a school for demons. He makes friends and has adventures, trying to hide that he’s really a human.
