In this scenario, it would be a complete shocker. Tony Stark is a hero, and Thanos is a villain. If he were to join Thanos, it might be because Thanos somehow convinced him that his plan was for the greater good. Maybe Thanos showed him a future where overpopulation and resource depletion were so bad that his 'snap' was the only solution. But this would go against everything Stark stands for, so it would be a very complex and dark turn for his character.
A plotline could involve Tony Stark joining Hydra to spy on them for the Avengers. He pretends to be on their side, but secretly feeds information back to his old team. Along the way, he has to be careful not to get caught and also has to deal with Hydra members who start to suspect him. This would create a lot of suspense and action in the fanfiction. Also, there could be a plot where Tony tries to change Hydra's ideology from within, using his charm and intelligence, but it turns out to be a much harder task than he thought.
Well, if Tony Stark joins Hydra in fanfiction, it would be a total chaos. His high - tech gadgets and genius mind would be a huge asset for Hydra. But his moral compass, which is usually in line with the Avengers, would be seriously conflicted. Maybe he would try to reform Hydra from the inside, using their resources for good. Or he could be brainwashed into doing really evil things at first until he snaps out of it.
Well, in some 'Tony Stark Fights Thanos' fanfiction, there's a plot where Tony manages to hack into Thanos' mind through some super - advanced tech he's developed. This allows him to create illusions in Thanos' head, confusing him during battle. Also, a common plot is that Tony sacrifices himself in a very heroic way. He uses all his suit's power and some experimental tech to send Thanos into a different dimension or something like that, saving the universe at the cost of his own life.
One interesting scenario could be Tony Stark using his superior intellect to outwit Thanos in a battle of wits rather than just brute force. He might create a device that can nullify the power of the Infinity Stones for a short time.
Comic storylines are fluid. Thanos and Tony Stark's interactions vary. So, there's no standard way Thanos kills Stark. It could involve cosmic powers, strategic battles, or unexpected plot twists.
Tony Stark himself is often very well - written in these fanfictions. Writers can really explore his genius, his determination, and his flaws. Another great character can be Pepper Potts. In some fanfictions, she plays a crucial role in helping Tony, like providing him with moral support or even getting involved in the fight in some way. And of course, Thanos. A well - written Thanos in these fanfictions is truly menacing, with his complex motives and powerful abilities clearly shown.
Perhaps Stark sees the destruction that the constant battles between superheroes and villains are causing to the Earth and the universe. He might think that Thanos' radical solution is the only way to bring a long - lasting peace. He could be convinced that by joining Thanos, he can influence Thanos to be less extreme in his methods. However, this is a very dangerous gamble as Thanos is not easily swayed.
In some fanfictions, Tony Stark kills Thanos by outsmarting him in a battle of wits. He could set up a series of elaborate traps and illusions that deceive Thanos into a vulnerable position. For instance, he might create false Infinity Stones that Thanos is lured into trying to obtain, only to find they are booby - trapped. Then, while Thanos is distracted, Stark delivers the fatal blow. Or, Stark could use his Iron Man suits in a very creative way. He could send a swarm of mini - suits to attack Thanos from all directions, overwhelming him and finally finding a way to kill him.
The death of Thanos at Tony Stark's hands might also change the power dynamics among the superheroes. Tony Stark would likely gain even more respect and admiration, becoming a sort of legend. This could lead to some heroes trying to emulate his methods, while others might be jealous or concerned about his new - found power and influence. Also, characters like Nebula and Gamora, who had a personal vendetta against Thanos, would have a major shift in their story arcs. They would need to find new purposes now that their main enemy is dead.
Thanos is extremely powerful with the Infinity Stones. However, Tony Stark has a history of coming up with solutions against seemingly unbeatable odds. In a fanfiction, the author might give Stark an edge by having him discover a hidden weakness of Thanos or develop a new weapon that can neutralize the Stones' power. So, it's possible for Stark to win if the story is written in a way that emphasizes his ingenuity.