Iron man

Stark becomes a founding member and eventual leader of the Avengers. Following his failed Ultron Program, the internal conflict within the Avengers due to the Sokovia Accords, and Thanos successfully erasing half of all life in the Blip, Stark retires, marries Pepper Potts, and they have a daughter named Morgan. However, Stark rejoins the Avengers on a final mission to undo Thanos' actions. He engineers a time travel device, and the Avengers successfully restore trillions of lives across the universe before Stark ultimately sacrifices his life to defeat Thanos and his army. Stark chooses (Spider-Man) Peter Parker as a successor.