Eren Yeager is the main protagonist of Attack on Titan and initially starts off as a hot-headed and impulsive young man who is driven by a desire to protect his loved ones and to see the world beyond the walls of his home, which is under constant threat from the Titans, giant humanoid creatures that eat humans.
As the story progresses, Eren discovers that he has the power of the Founding Titan, a powerful ability that allows him to control the memories and actions of all Titans. This power is tied to the royal bloodline of the Fritz family, which has used it for generations to manipulate and control the people of Paradis Island, where Eren lives.
Eren initially struggles with this power, which comes at a great cost to his physical and emotional well-being. He also becomes disillusioned with the government and military leaders of Paradis Island, who have used the Titans as weapons to achieve their own goals, even if it means sacrificing innocent lives.
As he learns more about the true nature of the world outside of the walls and the ongoing conflict between Marley and Eldia, two warring nations with a long history of violence and oppression, Eren becomes increasingly radical in his beliefs and actions.
In the latest chapters of the manga, Eren reveals that he has set in motion a plan to destroy the world outside of Paradis Island by unleashing the power of the Founding Titan. He believes that this is the only way to ensure the survival of his people and to break the cycle of violence and hatred that has plagued humanity for centuries.
While some fans view Eren’s actions as evil or villainous, others see them as a necessary sacrifice for the greater good. Eren’s motivations and beliefs are complex and rooted in his experiences and worldview, which have been shaped by his traumatic past, his relationships with other characters, and his own internal struggles.
It is worth noting that the series itself does not necessarily promote or condone Eren’s actions, but rather presents them as a morally ambiguous and complicated choice that has far-reaching consequences for all characters involved.
In conclusion, Eren’s choice to become “evil” or to pursue a path of violence and destruction is a complex and controversial aspect of his character arc in Attack on Titan. While there are different interpretations and opinions on his motivations and actions, it is clear that they are driven by a desire to protect his loved ones and to challenge the oppressive systems and ideologies that have caused so much suffering and pain.