TV-Series
Description
Piggymaru is a small, pig-shaped slime and the first companion of the protagonist Touka Mimori in the anime Failure Frame. He has a round, plump body with a pale, semi-translucent appearance and a lively, expressive face. The name Piggymaru, also rendered as Pigimaru, comes from the "pigi" sounds he makes. He lived in a dark forest near the old Disposal Ruins, where he was regularly bullied by other slimes. When Touka emerged from the ruins, he found Piggymaru being attacked by a group of slimes and saved him. Seeing the small slime struggle and keep fighting despite being outnumbered reminded Touka of his own circumstances, and that moment began their partnership.

In personality, Piggymaru is friendly, affectionate, and highly expressive despite being unable to speak in words. He has a strong sense of loyalty and a deep master-servant bond with Touka, following him constantly and acting on instinct rather than careful reasoning. He is very sensitive to Touka's emotions and moods, and he is brave and devoted, willing to put himself in danger to help or protect his companion. His motivations are simple and centered on Touka: he wants to stay by his side, support him, and share in his journey.

In the story, Piggymaru serves several important roles. He is Touka's constant companion, acting as a scout with a keen sense for danger and hiding under Touka's robe during encounters, which helps shield Touka from attacks and cover his blind spots. His small size and ability to change shape make him useful for stealth and reconnaissance, and he assists in light combat. He also provides emotional support, acting as a calming presence that helps Touka hold onto his humanity during his darker moments. As the party grows, Piggymaru becomes an effective battle support unit and helps connect Touka with others in the group, particularly the elf knight Seras Ashrain, with whom he fights alongside as part of the team.

Over time, Piggymaru develops considerably. He starts as a weak, bullied slime, but Touka later strengthens him using a special monster-boosting potion made from a book recovered from the ruins, and by sharing magical power with him. These changes make Piggymaru far more powerful and turn him into a genuinely important member of the group. He is highly intelligent for a slime and extremely resilient in dangerous situations, and he can combine with Touka to perform a coordinated multi-enemy attack called Assault Accel.

His key relationship is with Touka, who is both his savior and his first friend. Their bond grows into deep mutual trust and friendship, with Piggymaru effectively acting as Touka's eyes and sometimes his limbs in combat, helping him take opponents by surprise. Toward other allies such as Seras, he is friendly and cooperative, while he shows clear wariness only toward enemies of the group. Through his loyalty, courage, and growth, Piggymaru evolves from a helpless forest slime into a trusted and capable partner who travels with Touka through the entire journey.