Pochisan is a talking dog and a key companion character in the anime series 'Shumatsu Train Doko e Iku?'. Serving as both a mascot and a source of wisdom, Pochisan supports the main group of girls on their mysterious train journey through a post-apocalyptic world. His presence brings comic relief, emotional support, and guidance, making him an indispensable member of the cast. Loyal and perceptive, Pochisan helps navigate the dangers and uncertainties the group faces, often boosting morale with his unique perspective.