There were many animes in which the main character had transformed. The following were some of the more popular examples:
1." Tokyo Ghoul ": The protagonist, Kimki Yan, became a ghoul after mutation and embarked on a terrifying journey.
2 Naruto: The protagonist Naruto Uzumaki experienced many transformations and battle scenes during his growth, such as the transformation from a primary school student to a ninja.
3 One Piece: The protagonist Luffy experienced many adventures and transformations before becoming One Piece, such as the transformation from an ordinary fisherman to a pirate.
4." Attack of the Giant ": The protagonist Alan experienced many transformations and battle scenes during his growth, such as the transformation from a teenager to a giant.
5 " Ghost Blade ": After becoming a ghost, the protagonist Tanjiro experienced many battles and transformations, such as fighting ghosts and gradually adapting to the life of a ghost.
There were animes with big bosses as the main characters, such as One Piece, Naruto, Death Note, Slam Dunk, and so on. In these works, the protagonist usually had powerful strength and was a powerful villain at the beginning of the story, eventually growing into a powerful big Boss. The growth of these characters was also an important part of the whole story. It allowed the readers to feel the growth and changes of the main characters, and at the same time, it also brought more suspense and surprises to the story.
You might consider 'Steins;Gate'. The plot takes unexpected turns, and in some cases, the main character's fate is quite tragic. It's a sci-fi visual novel with a lot of depth and twists.
I'd recommend 'Echoes of the Void.' The main character's death in this novel is a powerful and unexpected conclusion that leaves a lasting impact. It's not a typical ending but gives the story a unique depth.
In 'Game of Thrones,' several main characters meet their demise before the end. For instance, Ned Stark's death early on sets the tone for the series' unpredictable and often brutal nature.
There were a few novels that could be recommended to readers who liked to regret the supporting characters after the main character died. Among them," They Regret After the Female Lead's Death " and " His Opponent Regrets After Breaking the Marriage " were novels that described the regret of the supporting characters after the main character died. These novels could satisfy the readers 'preferences for this plot.
There was no anime where everyone could become the main character. The storyline and character settings in anime usually had certain restrictions and characteristics. Not all anime characters could become the main character.
Some characters in anime might attract attention because of their special talents, skills, or background stories. For example, Naruto Uzumaki in Naruto, Monchi D. Luffy in One Piece, and so on.
In some anime storylines, the protagonist might need to experience a certain amount of growth and trials before finally becoming a hero or leader. For example, Alan Yaeger in Attack of the Giants, Azureshika Yuusuke in Death, and so on.
Although some characters in anime could become the main character, everyone's life experience and personality characteristics were different. Not all anime characters could be as charming and story-telling as the main character.
The main characters in web novels were usually not demon kings, but there were some novels or anime where the main characters were demon kings or similar characters. For example, Wei WuXian in "Grandmaster of the Devil" was a demon king level character, and Naruto in "Naruto" was also a demon king level character. However, the demon king's characters in anime and novels usually had a certain sense of mystery and great power, and were often related to evil forces.