"Armin Arlert is a pivotal character in the popular manga series, ""Attack on Titan."" Armin first appears as a young boy alongside Eren Yeager and Mikasa Ackerman in the year 845 when the Colossal Titan and the Armored Titan breach the Walls of the city, causing devastation and chaos. Armin is the childhood friend of Eren and Mikasa, and the three of them share a strong bond that helps them navigate the challenges of life inside the Walls and beyond.

Armin is initially portrayed as timid and frail, with a feeble constitution and a tendency to prioritize safety over risk-taking. However, despite his timid nature, Armin possesses a brilliant mind and a wealth of strategic knowledge. Throughout the series, Armin proves himself to be a valuable asset for the Survey Corps, the elite military branch tasked with exploring the outside world beyond the Walls. His strategic thinking and quick problem-solving abilities have saved the lives of his friends on numerous occasions.

Despite his intelligence and his strategic mindset, Armin struggles with feelings of inadequacy and self-doubt. He often questions his own abilities and his worth as a fighter, feeling as if he pales in comparison to his more physically capable comrades. However, Armin's value as a soldier and as a friend stems not from his physical prowess, but from his intellect and his unwavering loyalty to his friends and allies.

Armin's character undergoes significant development over the course of the series, both in terms of his confidence and his emotional resilience. He matures from a timid boy into a strategist and a leader, playing a crucial role in the fight against the Titans and in achieving victory against their enemies. Armin's growth and evolution as a character are a testament to the power of determination and the importance of friendship and camaraderie.

In conclusion, Armin Arlert is a complex and multifaceted character, whose intellect, strategic thinking, and loyalty to his friends have made him a beloved character in the ""Attack on Titan"" series. His character development over the course of the series is a testament to the strength of his will and his determination to succeed in the face of adversity. Fans of the manga series have come to love and admire Armin for his intelligence, his strength, and his unwavering spirit."