The character of Thanos gets defeated in the comics by a variety of factors and characters. It could be a powerful solo hero or a coordinated attack from a group of them.
Well, there are multiple instances and circumstances. It could be a combination of heroes or a single powerful character, depending on the specific comic arc.
Yes, there are likely fanfictions out there where Tony kills Thanos. The Marvel universe has a huge fan base, and fans often create alternative storylines. Some might explore this scenario to give a different take on the Infinity War and Endgame stories.
One consequence could be that Peter Quill Parker becomes a hero. People all over the universe might look up to him. But he may also face some jealousy or envy from other powerful beings.
Peter could use his agility. Since he's super - agile, he can dodge Thanos' attacks easily. Then, when Thanos is off - guard, Peter can strike. For instance, he can web up Thanos' hands so he can't use the Infinity Gauntlet properly.
It's a complex situation. Different storylines and villains have targeted the Avengers, but no one specific character can be said to have killed them all outright.
The Avengers have killed Thanos in certain comic runs. However, the comic universe is full of twists and turns, and his fate is not always straightforward. Different writers and storylines handle it differently.
Yes. Thanos' clashes with the Avengers in the comics led to the demise of some members. His might and strategic thinking gave him the upper hand in these battles.