In the anime Soul Hunter, the character known as Grande Mestre, whose name is more commonly rendered as Genshitenson or Geishitenson, occupies the highest position of authority within the world of immortals. He is the revered master of Mount Konron, also known as Kunlun Mountain, which serves as the central stronghold and training ground for the sennin, or immortals, who are tasked with maintaining balance between the spiritual and human realms.

As the Grand Master, Genshitenson is depicted as a figure of immense wisdom and foresight, possessing knowledge that extends far beyond that of his peers and disciples. His personality, while not explored in extensive depth, is that of a strategic and calculating leader. He is not a character given to impulsive action; instead, he operates from a position of calm authority, setting monumental events into motion by assigning critical tasks to others rather than involving himself directly in the conflicts that unfold.

Genshitenson's primary motivation is shrouded in mystery, even to his closest followers. He is the sole keeper of the true purpose behind the Houshin Project, also known as Project Soul Hunt. On the surface, his goal is to resolve the political chaos of the human world by replacing the corrupt Yin dynasty with the virtuous Shuu dynasty. To achieve this, he initiates the plan to seal 365 dangerous demons and spirits, headed by the malevolent fox-spirit Dakki, within the Houshin Dai, a special containment vessel. However, the official mission conceals a deeper, secret objective: the creation of a new world called the Shinkai. This mysterious realm is intended to serve a higher purpose, likely involving a permanent separation between the lives of humans and immortals, but the exact nature of this plan is known only to Genshitenson himself.

Within the narrative, Genshitenson's primary role is that of the catalyst and guiding authority. He is the one who selects his seemingly ill-suited disciple, Taikoubou, to be the executor of the Houshin Project. While other masters might choose their most powerful or disciplined student for such a monumental quest, Genshitenson instead entrusts the fate of the world to Taikoubou, a lazy, candy-loving young immortal who appears to hate study and meditation. This decision reveals Genshitenson's unique insight; he recognizes that the project requires not raw power, but Taikoubou's extraordinary cunning, strategic genius, and unorthodox methods to succeed.

The most critical relationship of Genshitenson is with his disciple, Taikoubou. He is the mentor who took the young orphan Taikoubou to Mount Konron after his parents were killed, training him in the magical arts. This master-student dynamic is defined by Genshitenson's elevated perspective. While others might see Taikoubou's flaws, the Grand Master sees the precise tool needed for a complex task. He acts as the distant authority figure who provides the mission and the resources but then allows Taikoubou the complete freedom to accomplish the goal using his own intelligence and resourcefulness. This suggests a deep, if understated, trust in his pupil's abilities.

Genshitenson remains a largely static character, serving more as a representation of ultimate knowledge and authority than as a figure who undergoes personal development. His significance comes from the secrets he holds and the pivotal actions he initiates. As for his abilities, Genshitenson is undoubtedly one of the most powerful beings in this universe, being the Grand Master of all immortals on Mount Konron. His power is implied through his position and the respect he commands, but it is his hidden knowledge about the nature of the world and the creation of the Shinkai that stands as his most notable and defining capability. He does not directly participate in the battles of the human realm, as his role is to direct the grand strategy from the spiritual mountain.