The impact was genuinely massive, but I'm not sure I've fully processed it even now. The initial reaction felt like this weird mix of grief and... relief? Like, we'd been on this decade-long journey with him, watched him become monstrous, and finally got that end point. A lot of the fandom splintered. You had the side that saw his death as a tragic necessity, the completion of his character arc from angry kid to a figure who had to be stopped by his own friends. Then you had the side that was just furious, feeling like it undermined his whole drive or was a betrayal of the 'keep moving forward' ethos.
What I found most interesting were the smaller community reactions. The 'shipping' circles went into absolute chaos—not just about the romantic implications, but about the emotional weight of Mikasa's final act. The fan art and fic output shifted overnight from action and politics to these intensely mournful, character-study pieces. It stopped being about who was 'right' in the war and became about legacy, memory, and whether any of it was worth the cost. The debates got less about plot holes and more about philosophy, which honestly elevated the whole fandom discourse for a while, even when it got heated.
Weirdly, his death made the story feel complete in a way an ambiguous ending wouldn't have. It forced closure. You can't theorize about Eren's return or secret plan anymore. The conversation moved on to the other characters living in his shadow, which is probably the point.