There were many animes like Savior of Gancheng Glorious Paradise: 1. Steins;Gate: It tells the story of time travel. One of the main characters is a person who can control time. He uses time travel to solve many problems. Attack on Titan: The story of humans being attacked by giants. The protagonist is a young investigator who saves humanity by interacting with giants. 3 "Rebellious Lelouch"(Code Geass): It tells the story of Lelouch who was accused of murdering his loved ones and faced a life and death crisis. The protagonist, Lelouch, achieved his goal by saving the world. Demon Slayer: It was a story that took place in ancient Japan. The protagonist was a ghost hunter who saved humanity by destroying ghosts. These animes all had plots where the male lead saved the world. They could choose according to their own preferences.