Pahn began his service as a Sarran knight, dedicated to rigorous training from youth. His intense focus on becoming the strongest recruit distanced him from comrades, ultimately earning him top rank in his class. Dissatisfied even then, he challenged his commander to a duel. Easily defeated, he left the knights to seek greater strength as a wandering adventurer.

During his travels, he crossed paths with Mikoto's group multiple times. After several encounters, he joined their party, transitioning from solitary wanderer to a trusted team member. He wields a double-edged poleaxe, reflecting his combat-oriented nature.

A transformation occurred when he allied with the organization Bizant for intelligence gathering. Subjected to demon magic, his appearance altered drastically: his hair turned completely white, his eyes shifted to a bright teal, his armor darkened to grey, and his clothing deepened to maroon. This magic rendered him incapable of aging, a condition that remained indefinitely.

Personality-wise, he maintains a calm and collected demeanor with a strong affinity for battle. He exhibits deep loyalty and protectiveness toward allies but harbors intense disdain for disrespectful individuals. He also possesses an appreciation for cute objects or creatures, adding nuance to his battle-focused character.

One thousand years later, during the era of "Sennen no Mahō," his agelessness allowed him to remain active. His physical appearance evolved slightly, featuring longer hair tied in a braid with an orange ribbon and the addition of two facial scars—one vertical across his right eye and another horizontal on the bridge of his nose—earned in battles against antagonistic forces. He wore a short tan cloak over his armor during this period. His role involved supporting new protagonists like Hagan, demonstrating continuity in his commitment to aiding others across the centuries.