Armin no Ojii-san

As the paternal grandfather of Armin Arlert, this elderly man played a pivotal role in shaping the series' central motivations. Before the tragic fall of Wall Maria, he secretly held a forbidden book filled with prohibited knowledge regarding the world outside the Walls. By passing this precious volume down to his grandson, he inadvertently ignited the lifelong dreams of both Armin and Eren Yeager to explore the uncharted lands beyond their prison.