In many ways, Tony Stark's actions in the movies themselves prove he has a heart. For example, his decision to sacrifice himself in 'Avengers: Endgame' was a selfless act that showed his deep love for the universe and its inhabitants. In fanfiction, this can be explored even further. Writers might depict his internal thoughts and emotions more deeply, showing how his experiences, like his time in captivity in the first Iron Man movie, shaped his sense of compassion. They could also show his relationships, such as with Pepper Potts and Rhodey, and how his love for them influenced his actions and decisions. Fanfiction often delves into the unspoken aspects of a character, and for Tony Stark, it can be used to highlight the very essence of his heart.
Well, in fanfiction, one key instance could be when Tony is faced with a moral dilemma. For example, he might have to choose between saving a large number of civilians or getting revenge on a villain who wronged him. If he chooses the former, it's proof of his heart. In the official MCU, he often made such selfless choices, and fanfiction can echo and expand on those moments.
Love is also a big theme. It could be romantic love, like his relationship with Pepper Potts showing a softer side of him that proves he has a heart. Or it could be platonic love, such as his deep friendships with the Avengers and how he cares for them in the fanfictions.
You can try fanfiction platforms like Archive of Our Own (AO3) or FanFiction.net. Just search for 'Proof that Tony Stark has a heart' on their search bars, and you should be able to find relevant fanfictions.
In this fanfiction, Tony Stark having a heart attack might force him to reevaluate his life. He might start thinking about all the times he's put himself in danger without much regard for his own well - being. It could also be a turning point for his relationships, like with Pepper Potts. She would be extremely worried and might take more control over his lifestyle to prevent further health issues.
Probably Rhodey. He's been Tony's friend for a long time. They've been through a lot together, and Rhodey would be very worried about Tony's well - being.
Definitely. Fanfiction is a platform for fans to let their imaginations run wild. Tony Stark, being a beloved and complex character, is a prime target for such creative reinterpretations. Magic in his hands could lead to all sorts of exciting plot developments. Maybe he could use magic to enhance his Iron Man suits, or he could use it to battle enemies that are immune to his normal technology - based attacks. There are countless possibilities in the realm of fanfiction.
There is definitely some out there. In some 'Tony Stark has a brother' fanfictions, the brother could be a rival, competing with Tony for their father's attention or for control of the company. Others might show them as a great team, using their combined genius to save the world in ways that the Avengers alone couldn't.
One key element is the transformation of Tony Stark. The Extremis changes him physically and mentally, so fanfictions often explore how he adapts to this new state. Another element is the power aspect. Writers usually describe how he uses the Extremis - enhanced abilities in different situations, like in battles or in his lab experiments.