"Eren became a protagonist who committed mass slaughter on a scale rarely seen in other works of fiction.
As for why I created such a story, part of it was my desire at the beginning to tell a narrative with a major twist—where the victim becomes the perpetrator. But a large factor was also my own immaturity and foolishness at the time, when I was in my early twenties. That aspect became the core of Eren’s character, leading him to the point where he confesses not as someone forced into wrongdoing by circumstances, but as someone who harbored a desire to do harm.
However, Attack on Titan had long since stopped being a minor work, and Eren became a character loved by many readers. In the end, without fully committing to portraying him as a detached figure, I found myself depicting him with a certain closeness and empathy. As a result, I feel there remains a sense of insincerity in the story’s conclusion—at least in my own view."
HE DID NOT SAY THE ENDING IS BAD OR SAY HE REGRETTED IT.