Armin Arlert is a key character in the popular anime and manga series Attack on Titan. Known for his intelligence and strategic thinking, Armin often plays a crucial role in devising plans to combat the Titans, the monstrous beings threatening humanity's existence. Despite his initial timid nature, Armin demonstrates significant growth throughout the series. He evolves from a fearful boy into a courageous leader, showcasing his determination to protect his friends, including Eren Yeager and Mikasa Ackerman. His character embodies the themes of bravery and the importance of intellect in overcoming challenges.