A few might be angry. If the fanfiction shows them in a negative light or changes their backstory in a way they don't like, they could get really mad. For example, if a character with a noble past is made into a villain in the fanfiction, they'd be furious.
There are many animes where the male lead is invincible. Here are some examples:
Naruto: Naruto Uzumaki has the power of the nine-tailed fox and is regarded as an invincible existence.
2. One Piece: Monchi D. Luffy has the ability to change his form at will with the rubber fruit and is regarded as an invincible existence.
3.< Death >: Ishida Yulong has the power of emptiness and can transform into various forms. He is regarded as an invincible existence.
4. Sword God Domain: Kirito possesses the power of the SAO game and can control all kinds of weapons and equipment. He is regarded as an invincible existence.
[5. The Attacking Giant: Alan Yeager has the power of a giant and can control giants. He is regarded as an invincible existence.]
The above are just some examples. There are many other male leads in anime that you can choose to watch according to your preferences and needs.
I have two books that I can recommend to you. They are both Naruto Doujinshi novels. They are " The Throne that Begins from Naruto " and " Naruto: The Opening Rage Against Uchiha Weasel."😋The former told the story of Uchiha Yuusuke announcing the start of the Fourth War of the Ninja World as Naruto, while the latter was about a super Naruto anime fan who transmigrated to the Naruto world. After scolding Uchiha Weasel, he suddenly awakened the god-level punching system and began a new journey to dominate Naruto. I hope you will like these two novels.😗
There are many animes in which the male lead has invincible eyes. The following are some of them:
1 Kirito in the Sword God Domain: Possesses the strongest eyes in the game world of "SAO", allowing him to move freely in the game. No attack can hit him.
2. Naruto Uzumaki from Naruto: His eyeballs are known as the "eyes of the nine-tailed fox". They have great power that can make his speed, strength, and ninjutsu even more outstanding.
3. Monchi D. Luffy in One Piece: His eyeballs can control water, wind, fire and other elements to make his abilities more powerful.
4. Ishida Yulong in "Death": His eyes were called "The Eyes of Death", which could see through the hearts of others and control their fate.
5. Rin Tosakaka from Fate/Zero: Her eyes can perceive the future and control fate. She is known as the "Holy Eye" and has invincible power.
These are some examples of anime male leads with invincible eyes. Of course, there are many other works with similar settings.
😋I recommend the following three anime novels with invincible male leads to you: "Unlimited Animation Movie Squad","The Diamond Ace, Sawamura Eichun", and "I'll make trouble in anime in various ways". Wang Hao was the main character of 'Limitless Animation Movie Squad,' who planned to blow up the heads of raiders and travelers, while the main character of 'Diamond Ace: Sawamura Eichun' was a young man with a heart disease who got a healthy body after rebirth. How would he change the ending? In "To Make Trouble in the Animation Series in Various Ways," the main character would make trouble at will and be a joke. In short, he was a male protagonist who pursued the path of passion. I hope you like this fairy's recommendation. Muah ~😗
The male protagonist can refer to the following plot:
1. Transmigrate into an anime world and become the protagonist. Have invincible strength and ability to defeat all kinds of enemies and become the invincible existence of this world.
In this world, the male protagonist made all kinds of friends and enemies, experienced all kinds of adventures and challenges, and constantly grew and improved his abilities.
The male protagonist experienced many touching stories in this world. He met the female protagonist and fell in love with her. Together, they faced the challenges of this world and finally became invincible.
After the male protagonist transmigrated to the anime world, he found that he had the ability similar to the protagonist and began to take action in this world to become a character that received much attention.
The male protagonist has many friends and enemies in this world. He continues to grow and improve his ability, and finally becomes an invincible existence to save this world.
There were many harem animes with invincible male leads, such as "Sword God Realm,""The Gate of the Stone of Destiny,""Fate/Zero,""Battle of the Date,""Science's Super Electromagnetic Cannon,""Forbidden Magic Book Catalog,""A Science's Super Electromagnetic Cannon,""Light Sound Girl,""Daily Life,""Speed Up the World,""Magical Girl Little Yuan," and "Even a chuunibyou must fall in love!" My Hero Academy, Naruto, Inuyasha, One Piece, Reaper, and so on.
I recommend novels like " I'll Take the Lead to Act as a Fork,"" The Protagonist's Halo Shrouds Her Body, and It's Over,"" The Strongest Animation System," and " The Onmyoji of the Two-Dimensional World." The main characters of these works were born with the aura of a main character. They were powerful existences in all worlds and could easily deal with all their enemies. I hope you like my recommendation.
Some characters may be excited. They might enjoy seeing their world expanded in new ways. For example, a side character could be happy to see themselves getting more spotlight in the fanfiction.
Well, it really depends on the specific fanfic. But often, it could include characters like the Doctor from 'Doctor Who' and his various companions such as Rose Tyler, Martha Jones, or Donna Noble. They are very popular characters to feature in this type of fanfic.