Gibéon is a character introduced in Pokémon Horizons: The Series as the unseen leader of the Explorers, an organization initially established to support the legendary adventurer Lucius. His existence and true nature as the group's founder are revealed only after a significant investigation into stolen secrets, marking him as a central figure in the series' overarching conflict. Gibéon's background indicates he was once a contemporary and friend of Lucius, but the circumstances that led the Explorers to evolve from a supportive group into a more antagonistic force are tied directly to his personal quest. His advanced age suggests he has lived for an unusually long time, a longevity that is implied to be linked to a mysterious substance known as Rakurium, or the Eternal Blessing.

Gibéon is depicted as a mysterious and commanding presence, often shown resting in an advanced, technological chair within a chamber filled with a peculiar pink mist. This mist is the same as that which emanates from the mythical Pokémon Terapagos, establishing a direct connection between Gibéon’s environment and the creature the Explorers seek. His primary motivation is to secure the Eternal Blessing, a substance he believes is the key to preserving his life. To this end, he has made it his mission to capture Terapagos once it has fully awakened, hoping to use its power to access more of the Rakurium and thereby secure his continued existence, effectively pursuing a form of immortality.

In the story, Gibéon serves as the true antagonist whose directives drive much of the Explorers' actions against the protagonist Liko and her friends. His role is defined by his high-level strategic orders, which are then carried out by his subordinates, most notably Amethio. During the series, after Friede discovers that the Rakurium has been stolen, Gibéon personally summons Amethio. In this meeting, he reveals his identity and directly assigns Amethio the critical mission of capturing the awakened Terapagos, underscoring the immense importance of this goal to the Explorers. His development is largely implied through this revelation, transforming from an off-screen unknown into a tangible, physically frail, yet immensely determined character whose personal battle against mortality fuels the central plot.

Key relationships are central to his character. He is revealed to be the grandfather of Amethio, one of the primary agents pursuing the rising Volt Tacklers, and he entrusts him with the most vital of missions. Though not directly stated, it is heavily implied that his connection to Lucius, the original hero connected to Terapagos and the Six Heroes, is foundational to both his past and his present goals. Gibéon’s notable ability is not a combat skill, but his apparent secret to longevity, which is directly linked to the consumption or use of Rakurium. This substance has kept him alive for decades, if not centuries, making his continued survival the central engine of the Explorers' plan.