Another possibility is that there is some sort of magical or otherworldly influence. Perhaps an evil force manipulates Naruto into believing that Drogo is a danger to his world or loved ones. So, Naruto, being the hero he is, takes it upon himself to eliminate the perceived threat. However, this would go against Naruto's usual nature of trying to understand his opponents first, so it would be an interesting twist in the fanfiction.
On a more personal level, Naruto himself might have to deal with the guilt. Despite being in a different world and situation, Naruto has a strong moral compass. Killing Drogo, even if it was in self - defense or due to a misunderstanding, could haunt him. He might question his actions and his role as a hero, which could lead to an internal struggle and character development within the fanfiction.
Well, perhaps Harry Potter could find himself in the world of Khal Drogo. Maybe they would form an unlikely alliance. Harry could use his magic to help Khal Drogo in battles, like creating magical defenses for his people. And Khal Drogo, with his great warrior skills, could teach Harry some physical combat skills that wizards don't usually have.
Well, it could be a story where Naruto, being the son of Khal Drogo, might inherit some of his father's leadership skills and warrior spirit. Maybe he would use his ninja abilities along with the boldness from his supposed father to face new and greater threats in the Naruto universe. He could also form unique alliances with characters from both the Naruto world and the world of Khal Drogo, creating a whole new dynamic of power and relationships.
Daenerys is an obvious choice. Their relationship in the original series was complex and passionate, and in fanfiction, there are so many ways to explore it further. Another good character could be Ser Jorah Mormont. His loyalty to Daenerys and his knowledge of Westeros could create interesting dynamics with Khal Drogo. And perhaps the witch Mirri Maz Duur could also be paired with him in a fanfiction that delves into the more magical and vengeful aspects of the story, exploring what could have happened if their interactions had taken a different turn.
Another possibility is a complete character distortion in the fanfiction. The writer might decide to create a 'bad Naruto' version where he has lost all his positive traits. However, this is quite far - fetched considering the strong foundation of Naruto's character in the original series. It would be a very different and probably controversial take on the Naruto - Hinata relationship.
In a Naruto kills Thanos fanfiction, Naruto's sealing techniques could play a major role. He could use sealing jutsu to seal away Thanos' powers or even Thanos himself. Naruto has experience in dealing with powerful foes and sealing them away. Also, Naruto has the ability to sense danger and react quickly. Thanos, on the other hand, may underestimate Naruto at first. By the time he realizes Naruto's true strength, it could be too late for him.
In fanfiction, Naruto might kill a god through the power of his strong will and the unique abilities he has. For example, his Sage Mode could be enhanced to a level that allows him to overpower a god - like entity. Also, his Nine - Tails chakra could be combined with some new, made - up powers in the fanfiction world to give him the strength needed.
Well, in a fanfiction scenario, Naruto might kill Aizen if he manages to use his shadow clones to outwit Aizen's illusions. Naruto could also use his Sage Mode to sense Aizen's reiatsu and counter his attacks. Maybe he combines his Rasengan with some new jutsu he's developed specifically to deal with Aizen's powers.
Well, it could happen if Naruto has some sort of special weapon. For example, he might get a sword that can disrupt Hidan's connection with his voodoo - like powers. Once that connection is broken, Naruto could easily defeat and kill Hidan. Also, Naruto's growth in chakra control and strength could play a role. With his enhanced abilities, he could overpower Hidan and deliver a fatal blow.
In fanfiction, Khal Drogo is often portrayed as a strong and fearless leader. His physical prowess and his loyalty to his people are emphasized. He is shown as a man who is initially skeptical of Daenerys but quickly comes to respect her. Daenerys, on the other hand, is depicted as a complex character. She is a young woman trying to assert herself in a male - dominated world. In the context of her relationship with Khal Drogo, she is sometimes shown as a vulnerable yet determined figure, using her intelligence to gain influence among the Dothraki.