Anpanman sprang to life when a star descended into an anpan baked by Uncle Jam, granting the pastry vitality and consciousness. His head consists entirely of tsubu-an-filled bread, serving as his sole energy source and eliminating conventional sustenance needs.

He possesses a large anpan head with a red nose, rosy cheeks, and a perpetual smile. His attire includes a red-orange uniform, brown flight-cape, yellow gloves, boots, belt, and a chest smiley emblem. Water or contaminants compromise his head, drastically weakening him; a transparent helmet shields him during aquatic or rainy missions.

His existence revolves around altruism fueled by the fulfillment of receiving gratitude. He patrols tirelessly, aiding those in distress and combating threats. His defining sacrifice involves tearing portions of his head to feed the starving, immediately losing strength and flight until Uncle Jam provides a fresh replacement.

Capabilities include flight via cape, superhuman strength demonstrated through metal-shattering "An-punch" and "An-kick" attacks, regenerative head replacement, and global super-hearing to detect cries for help.

Uncle Jam crafts his heads while Batako maintains his cape, both serving as parental figures. Allies include heroic trio partners Currypanman and Shokupanman; mentees Melonpanna, Rollpanna, and Creampanda; and Cheese—a dog he saved by sharing his head. His dynamic with same-day-born nemesis Baikinman blends conflict with situational cooperation against larger threats, devoid of hatred.

All narratives emphasize sacrifice and resilience, frequently depicting head depletion scenarios requiring Uncle Jam's intervention. Beyond heroics, he mentors younger characters in courage and compassion, symbolizing hope through self-diminishment for others' survival. This core theme reflects creator Takashi Yanase's WWII starvation experiences, casting Anpanman as an allegory for sustenance and selflessness.