The 'thanos death sentence prose novel' might be really interesting. Thanos is a well - known character. In the novel, the death sentence aspect could be about his infamous act of wiping out half of all life. It could potentially show his backstory, what led him to believe that this extreme measure was necessary, perhaps through his experiences on his home planet or his encounters with other powerful beings. The prose format would allow for a detailed and in - depth exploration of these ideas.
Probably the other Avengers like Captain America. He could play a role in trying to save Tony or in the fight against Thanos that ultimately leads to Tony's death. Maybe Doctor Strange as well. Since he has knowledge of the future and the Infinity Stones, he might be involved in some way. He could either try to prevent Tony's death or his actions could inadvertently lead to it.
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.
Well, it could be the focus on Thanos' death sentence. Not many works might center around this specific aspect of his character. It gives a unique angle to explore his motives and the consequences.
In a fanfiction, Harry Potter as the Master of Death would likely win. He has the power to control death itself, which is a very fundamental and powerful ability. Thanos, while extremely powerful with the Infinity Stones, his powers are more about physical might and control over the universe on a more material level. Harry's connection to death gives him an edge that Thanos may not be able to counter.