Most characters in Japanese anime follow some basic rules about balance and power scaling to make each combat scene tense, exciting, and meaningful. Protagonists will start off weak and use training and experience to get gradually stronger, while the villains start off powerful, but not so much that the hero stands no chance. Then, there are overpowered anime characters who break all the rules.
Source：https://www.cbr.com/strongest-op-anime-characters-ranked/
