To create a successful manga series, you need a combination of factors. Good character development is crucial - make your characters relatable and interesting. Also, pay attention to the art style - it should be visually appealing and consistent. And don't forget a well-structured plot with twists and turns to keep readers engaged.
The key to a successful manga series is having a clear vision of your story. Start with a solid concept, build complex characters, and ensure the pacing of the story is just right. Also, do your research on the market and the type of manga that's popular to better connect with your audience.