Armin Arlert (Arumin Arureruto) is a childhood friend of Eren's and the deuteragonist in the Attack on Titan series. Armin was very timid as a child and coupled with the fact that he was physically frail, often ended up an easy target for bullies. He was so timid that he would refuse to fight back despite being taunted to do so, always requiring Eren and Mikasa to fend for him. As such, he grew up having very low opinion of himself and thinking that he is useless. His enlisted only because his two best friends were enlisting. Despite being timid, he has a variety of traits that contrast his timid self, which began to show as he grows older and learns to appreciate his own talents and develop a higher opinion of himself!