If Naruto loses all his friends in a tragic way, perhaps in a battle against an overwhelming enemy that the village could have prevented. His grief could turn into hatred towards the shinobi system. He may decide that the existing order is what causes all this pain and destruction, and then he starts to work against it, becoming a villain in the eyes of the village.
His confidence could turn into over - confidence bordering on arrogance. As a villain, he might think he is above everyone else and that his way is the only right way. He would no longer listen to advice or consider the consequences of his actions on others, believing that he can handle any situation on his own, no matter how dangerous or unethical.
It could be Kabuto. Since he has a lot of knowledge about medical ninjutsu and experiments, he might see Naruto's robotic form as a threat or something he can use for his own evil purposes. He could try to control Naruto's robotic functions and turn him against his friends.
If Naruto turns into a super villain in fanfiction, perhaps his transformation is due to some dark influence. It could be a powerful and evil chakra that corrupts him. He would then start to use his jutsu in cruel and unexpected ways. For example, instead of using the Rasengan to protect, he might use it to destroy important buildings or harm innocent people. His friends would be shocked and try to bring him back to the good side, but he would be too far gone. This could lead to some really intense battles and emotional confrontations between him and his former comrades.
Some recommended novels where the antagonist becomes the antagonist "are Salted Fish Young Master dressed as the villain's white moonlight" and "Salted Fish Junior Sister forced to become the villain's white moonlight". These two novels depict the struggles and growth of the main characters as they traverse into the roles of antagonists.
One possibility could be that Batman, after facing one too many betrayals in Gotham, decides to take a different path. Maybe the constant struggle against crime with little real change in the city makes him cynical. He could start using his skills and resources to control the underworld instead of fighting it. For example, he might start dictating which criminals can operate and where, creating a new order that is still dark but under his command.
If Naruto becomes a villain in the DC crossover, he might set his sights on Superman. Naruto could believe that Superman's power is a threat to the balance he wants to create. He would use his ninjutsu to try and take on Superman. For example, he could use his Rasengan, a powerful spinning ball of chakra. However, Superman's strength and heat vision would be tough for Naruto to overcome. This would lead to an epic battle between the two, with the other DC heroes and Naruto's possible allies getting involved as well.
Maybe the plot could revolve around Naruto getting influenced by a powerful and evil entity. This entity could corrupt his mind, making him believe that the only way to achieve true peace is through domination. So, he would begin to gather power, using his skills and charisma, but for the wrong reasons. He would form his own group of followers, who also believe in his new 'world order' ideas, and start a war against the existing shinobi villages.
" The World of Otto: Starting with the Evil Tiga " was a recommended novel. It told the story of the protagonist, Li Xiaoyun, who transmigrated to the World of Otto and became the villain of Tiga, Masaki Keigo. In this world, the ancient monsters awakened, the earth fell into chaos, and the universe people began to pay attention to earth. This novel was written by Maka Zeta.
Here are some recommendations for novels that turn into villains:
1. " I Become the Villain at the Beginning ": This was a fantasy novel. It told the story of the protagonist, Li Chenfeng, who had transmigrated to a fantasy continent and possessed the body of the eldest young master of a top-tier family, becoming a villain. However, the protagonist displayed extraordinary talent and charm in this world. Not only was he talented in cultivation, but he was also excellent in zither, chess, calligraphy, painting, and speech. On the surface, he pretended to be a righteous young man, but behind his back, he was sowing discord between the righteous sects. The plot was very interesting.
2. " Godly Tycoon: My Fiancée Is the Female CEO of the Villain ": This was a light-hearted and humorous novel. It told the story of the protagonist transmigrating into a fantasy world and becoming the fiancé of the female CEO of the Villain. The protagonist faced many challenges and difficulties, but with his wisdom and courage, he gradually turned the tables and became a tycoon. The novel was full of jokes and cheerful plots.
3. " The Strongest Boss System ": This is a villain novel in the Wuxia world. The protagonist, Su Xin, obtained all the techniques and martial arts of the villains in the Wuxia world through a villain system. He decided to become the most ruthless and powerful villain in this life and launched a series of exciting adventures and battles. This novel was full of decisive killing and face-slapping plots.
Please note that the novels recommended above are based on the search results provided and may not be comprehensive or accurate. It is recommended that readers check and choose works that are suitable for themselves before reading.