One possible plotline could be Thanos trying to win Tony over while still being true to his villainous ways. Another could be Tony using Thanos' feelings to his advantage in a battle.
Well, one possibility could be that Tony sacrifices himself in a final battle against Thanos. Maybe he uses some new, untested technology that ultimately drains his life force but also manages to defeat Thanos. Another idea could be that Thanos, in a moment of unexpected mercy, spares Tony's life initially but then something goes wrong in the aftermath, leading to Tony's death. For example, perhaps the Infinity Stones' power backlash affects Tony in a way that kills him.
In a 'Tony kills Thanos' fanfiction, the plot could start with Tony being haunted by his previous failures against Thanos. He decides to go on a solo mission to study Thanos more closely. He discovers a way to disrupt Thanos' connection to the Infinity Stones. With this knowledge, he devises a plan. He lures Thanos into a trap where he has set up a device that can nullify the power of the Stones. Then, in a tense battle, Tony uses his own advanced technology and combat skills to fight Thanos without the Stones' advantage and finally manages to kill him. This could be a story of redemption for Tony, showing his determination and ingenuity in the face of seemingly insurmountable odds.
A possible plotline is that Thanos hears about the powerful chakra in the Naruto world and decides to conquer it. Naruto stands up to him, and during the fight, Naruto unlocks a new form of his power that is on par with Thanos' strength with the Infinity Stones. Along the way, Naruto teams up with some of his old foes who also realize the danger Thanos poses. They all fight together to protect their world.
One possible reason could be to test Tony's loyalty. Thanos might want to see if Tony is truly committed to his own self - interest over protecting Peter. Another reason could be to break Tony psychologically. Tony has a father - like relationship with Peter, and forcing him to harm Peter would be a huge blow to Tony's mental state.
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 possible plotline could be the daughter inheriting Tony's genius and getting involved in some high - tech project at a young age. For example, she might build her own mini - Iron Man suit.
One possible plotline could be Tony as a panther facing off against some kind of threat to his territory. Maybe there are other supernatural creatures trying to encroach on his space.
In a Loki x Thanos mpreg fanfiction, a potential plotline could be that the pregnancy is part of a prophecy. Loki and Thanos have to deal with the implications of this prophecy, whether it means the child will bring great power or destruction. There could be a lot of internal struggle for Loki as he contemplates his role as a soon - to - be parent, especially considering Thanos' nature. And Thanos could be using the situation to gain an advantage over his enemies, all while trying to protect Loki and the unborn from those who would oppose them.
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.
Another aspect could be the emotional turmoil for the other Avengers. They would surely be scrambling to find Tony. Captain America might feel especially guilty, considering their past differences. The team would have to put aside their differences completely to rescue Tony. They might start by gathering intel on Thanos' whereabouts and formulating a plan that involves their unique skills. For example, Black Widow could use her espionage skills to infiltrate Thanos' base, while Thor could provide the brute force needed in a direct confrontation.