Originally named Tomokui Kanata, a human esper murdered by Kirimine Aoi despite having saved her, Goburou reincarnated with his Absorption ability and past memories intact, awakening as a goblin infant. An elder goblin bestowed his new name.

As a newborn goblin, he appeared small and green-skinned, bald, with one protruding canine tooth, pointed eyelids, and the size of an elementary child. His Absorption ability allowed him to permanently acquire abilities, traits, or properties from consumed creatures or materials. Consuming a Night Viper granted Thermography, Venom, Poison Resistance, and Evil Eye. Eating an Orc provided Libido, Orc Language, and Appraisal. This extended to inanimate objects; spirit stones offered elemental manipulation, while weapons enhanced physical attributes.

He rapidly evolved through species ranks via strategic consumption and combat. By day 13, he became a rare Hobgoblin variant, blessed by the Great God of Origin and Demise, gaining a human-like appearance with black skin and hair resembling his teenage human self. On day 34, he ranked up to an Ogre, standing 2.5 meters tall with red tattoo-like lines, gray shoulder-length hair, and two forehead horns. Around day 107, he evolved into an Apostle Lord, shrinking to 2 meters but developing denser musculature, golden markings, blood-red eyes, and three horns. By day 245, he reached the Vajrayaksa Overlord stage, growing taller with five crown-like horns, silver-white hair, golden eyes, and two additional arms below the armpits.

Goburou displayed high intelligence and adaptability, employing cunning strategies like using less intelligent goblins as tactical pawns. He showed compassion by protecting human women kidnapped for breeding by older goblins, integrating them as skilled craftswomen and taking them as lovers. He maintained a strict moral code against unnecessary cruelty but used brutal tactics like torture against enemies committing sexual violence. Influenced by Buddhist principles, he viewed killing for sustenance as justified but avoided wanton violence. As a leader, he rigorously trained subordinates, rewarded achievements, and permitted departures with gifts. He demonstrated deep affection for his children, ensuring confident growth through a human-like upbringing.

Key followers included brood brother and right-hand combatant Gobkichi, primary mate Gobmi, and Gobue (Gobkichi's mate). His human lovers were Felicia and Alma Timiano (cooks/tailors), Emery Furado (blacksmith), Spinel Fean (alchemist), and Rubellia Walline (warrior). They bore hybrid children: Auro and Argento (half-ogres), Oniwaka (pure ogre), Nicola (human), and Opushii (jewel lord). These children aged rapidly, except Nicola due to her human biology.

He accumulated hundreds of abilities, including Pack Leadership from Black Wolves, Pyrokinesis from fire spirit stones, and Golden Thread Creation from Argiopes. Combat skills like Predict and Tyranny of the Beast King enhanced his tactics. Non-combat abilities included Item Box for storage and Golden Rule for economic advantage. After losing an arm to a Red Bear, he replaced it with the indestructible Silver Artificial Arm artifact.

His leadership expanded to include kobolds, elves, and others, forming the mercenary group Parabellum. He negotiated alliances, developed infrastructure like hot springs and farms, and created communication devices using his blood. He prioritized community advancement while navigating complex interspecies dynamics and political conflicts.