The idea of Eren Yeager in a harem scenario is interesting because it takes a character from a serious and often dark story and puts him in a more light - hearted, relationship - focused situation. It allows for different character interactions that we don't see in the original work.
There are various 'Eren Yeager x Harem' fanfictions. Some stories could be about Eren being in a harem situation where he has to balance his duties and his relationships. Maybe in one, he is training to fight Titans while also navigating his feelings for multiple girls. These fanfictions often play with the existing character dynamics and create new scenarios for the characters to interact in.
It's also possible that the Yeager family story is centered around a particular event. For example, they could have been part of a historical event in their town or region. They might have played a role in helping others during a disaster, like a flood or a fire. This event could have shaped their family values and how they interact with the community. It could also be a story of love and relationships within the family, with tales of how different family members met their partners and how they supported each other through thick and thin.
There could be an elderly member in the Yeager family, like a grandparent. This person might hold the key to the family's past, with stories of their ancestors and the family's origins. Their wisdom and experience could be a guiding force for the rest of the family in the story.
Eren's death in the manga was a powerful moment. It was brought about by a combination of his own decisions, the opposition he faced, and the overall plot developments. It left a lasting impression on readers.