Gólem is a colossal monster composed of craggy rocks, whose imposing physical presence is matched by a surprisingly gentle and kind heart. His appearance is that of a giant humanoid figure made of stone, with an ancient, weathered face that often resembles Egyptian-style sculptures, complete with a distinct goatee in the anime's design. Despite his fearsome and intimidating stature, which often frightens those who do not know him, his true nature is one of a peaceful and caring individual.

Long before joining the searchers, Gólem served as the solemn guardian of a vast graveyard filled with Lost Disks, the remnants of monsters who fell in a terrible battle and could no longer be revived. He patrolled this field of memory to ensure no one would desecrate the resting place of his fallen comrades, a duty he carried out for many years, isolated and burdened by the tragedy he had witnessed. This traumatic past is the root of his core personality; having seen the horrors of violence and war firsthand, he developed a deep-seated trauma that made him staunchly oppose fighting. He is inherently a pacifist who loves nature, flowers, and animals, finding solace in their beauty and fragility, a stark contrast to his own hardy, unyielding form.

This gentle disposition, however, hides a powerful and unpredictable fury. When pushed to his absolute limit, particularly if his friends are in grave danger or if he witnesses wanton destruction of the things he loves, Gólem can enter a berserker rage. In this state, his usual hesitation vanishes, and he becomes an unstoppable, merciless force of nature until the threat is neutralized or he regains control of his senses. His motivations for joining the group are rooted in his desire to atone for past violence and to prevent further suffering. After being convinced to leave his post, he accompanies the searchers to stop the evil Moo, seeing it as a way to honor the fallen monsters he once protected and to ensure no more lives are lost to conflict. He often acts as the protector of the group, using his massive body as a shield, with a particular focus on watching over the human girl Holly, who is small and vulnerable compared to the others.

Gólem forms deep and meaningful bonds with his companions, especially the young boy Genki, whose courage and determination inspire him. His key relationships are marked by his loyalty and quiet support, though he also develops unique friendships that highlight his character. He befriended Undine, a water spirit who was initially part of the enemy forces. Despite her betrayal, Gólem saved her from death, unable to abandon someone he considered a friend, and promised to visit her again. Similarly, his immense compassion led him to befriend a sick girl named Michelle, for whom he fought relentlessly in a tournament to win prize money for her life-saving operation. These episodes consistently show that his motivation is driven by empathy rather than glory.

While his personality is gentle, his physical capabilities are anything but. His rock body grants him phenomenal strength and incredible defensive power, able to widen caves with a single punch and survive powerful attacks. He can manipulate the stones that make up his body, allowing him to extend his limbs for long-range punches or even detach his fists as flying projectiles, reminiscent of a rocket punch. He is capable of generating powerful shockwaves by stomping the ground with Quake, or separating his body into a spinning vortex of debris in an attack known as Cyclone. For all his physical power, he has notable vulnerabilities, including a profound aquaphobia. Due to his heavy, stone body being unable to swim, large bodies of water terrify him and can leave him paralyzed with fear.

Over the course of his journey, Gólem develops from a reclusive, solitary guardian burdened by guilt into a reliable and brave member of a family. He learns to trust others and to channel his immense power not just for protection, but for a righteous cause. His greatest sacrifice comes when it is revealed that he is one of five monsters who carries a fragment of the legendary Phoenix's soul. To defeat Moo, Gólem willingly merges his being with his friends to resurrect the Phoenix, an act that requires him to give up his individual existence. This ultimate selfless act is the culmination of his journey from a tortured pacifist to a true hero who faces his deepest fears and sacrifices himself for the sake of the world.