If friendly aliens were to come to Earth and seek a single person to represent the human race as an ambassador, it would be an incredibly significant and challenging decision to make. There is no universally accepted "official representative" of the human race, and choosing one individual would likely raise various debates and considerations.
That being said, several criteria might be taken into account when selecting an ambassador:
Global Recognition: The individual should be widely recognized and respected on a global scale to enhance the chances of being accepted as a representative by people from diverse cultures and backgrounds.
Diplomacy and Communication Skills: The ambassador should possess exceptional diplomatic and communication skills to bridge the potential communication gap with the aliens and ensure clear and positive exchanges.
Cultural Understanding: Understanding and appreciating the diversity of human cultures and being able to navigate cultural sensitivities would be essential for the ambassador.
Scientific Knowledge: Given the context of meeting intelligent extraterrestrial beings, having a solid understanding of scientific principles and the ability to convey complex scientific concepts could be valuable.
Ethical and Moral Integrity: The chosen individual should demonstrate strong ethical values and moral integrity to represent humanity's best interests and values.
Leadership and Empathy: Leadership qualities and the ability to empathize with various groups of people would be important for fostering unity and representing a broad range of human perspectives.
Given the fictional nature of the scenario, there isn't a specific person who could be definitively chosen as the ambassador. However, in popular culture, science fiction stories have often portrayed scientists, astronauts, or diplomats as representatives of humanity in such scenarios.