One of the top stories could be his decisions regarding rule changes in baseball. For example, the implementation of the pitch clock has been a significant change under his leadership. It has sped up the game and received a mixed reaction from players, coaches, and fans.
In the 'Arknights Who Is Real' event story, it might introduce new characters or expand on the backstories of existing ones. The plot could revolve around a series of investigations or encounters that force the characters to face the concept of reality. For example, there could be illusions or false identities that the operators need to decipher. This event story may also be related to the overall lore of Arknights, adding more depth to the game's world - building.
One interesting Arknights fanfic could be those that explore the backstories of the operators in more depth. For example, a fanfic might focus on the early days of Amiya's leadership and how she coped with the various challenges. Another type could be the ones that create alternate universes where the factions have different relationships. Some fanfics also center around the relationships between different operators, like the friendship or potential romances.
The determination of the real protagonist in the Arknights event story is subjective. Different players might consider different characters as the main focus based on their actions and influence on the story's development.
One common theme could be friendship. Since they are two characters, their relationship might be explored in terms of how they support each other and grow together.
I'm not sure specifically who Manfred Nagl is in relation to science fiction without more context. He could be an author, a researcher, or a fan. There may be some works of science fiction he has contributed to, either as a writer or in some other capacity.
One key feature could be the mystery aspect. It makes players curious about what's really going on. Another might be the new interactions between characters that are unique to this event.