One Piece is the longest-running and best-selling manga series in history, and has been serialized in Weekly Shōnen Jump since 1997. It is a pirate adventure story that shares some themes with Demon Slayer, such as friendship, family, and morality.
My Hero Academia is a popular manga series that has been serialized in Weekly Shōnen Jump since 2014. It is a superhero story that follows a group of students who aspire to become professional heroes in a world where most people have special abilities called Quirks. It has a similar genre and target audience as Demon Slayer, and also features a lot of action and humor.
Jujutsu Kaisen is a recent manga series that has been serialized in Weekly Shōnen Jump since 2018. It is a dark fantasy story that revolves around a high school student who becomes the host of a powerful curse, and joins a secret organization of sorcerers who fight against other curses. It has a similar premise and tone as Demon Slayer, and also involves supernatural elements and battles.
The Promised Neverland is a critically acclaimed manga series that was serialized in Weekly Shōnen Jump from 2016 to 2020. It is a psychological thriller that follows a group of children who discover the dark truth behind their orphanage, and plan to escape from their captors. It has a different genre and style from Demon Slayer, but also explores themes such as survival, loyalty, and courage.
Black Clover is a popular manga series that has been serialized in Weekly Shōnen Jump since 2015. It is a fantasy story that follows two orphaned boys who dream of becoming the Wizard King, the strongest and most respected mage in the kingdom. It has a similar genre and target audience as Demon Slayer, and also features a lot of magic and combat.