TV-Series
Description
Erwin von Arnim is the fifth son of the impoverished Arnim noble family, rulers of a small village housing roughly 500 people. Excluded from inheritance, he becomes an adventurer, training rigorously in swordsmanship to secure a scholarship for the Adventurer's Academy. There, he achieves top swordsman status in his class. He meets Wendelin von Benno Baumeister during orientation, forming his first friendship. Together with Louise and Ina, rescued from wolves, they establish the adventuring party "Dragon Busters," central to their story. As Wendelin attains baronet and later earl rank, Erwin pledges loyalty as his first retainer, rising to head retainer just below Rodrich, with responsibilities and status increasing alongside Wendelin's peerage.

Approximately 170 cm tall with a sharp appearance, his hair color varies: light novels and manga depict short brown hair in a crew cut, while anime adaptations show blonde hair and grey eyes. His personality is earnest, trustworthy, and ambitious, though prone to stubbornness and narrow-mindedness. He is highly selective in romance, pursuing women with intense focus but recovering quickly from heartbreaks, such as his unrequited first love for Karla, typically resuming normalcy within a week.

Lacking magical abilities, he displays exceptional skill with traditional swords and Japanese-style katanas, impressing high-ranking knights like Knight Commander Warren, who mentors him. He discovers a greater aptitude for Kenjutsu than Western swordsmanship, though he hasn't mastered Battōjutsu or Iaijutsu. He temporarily develops archery skills to court Karla but abandons them after meeting his future wife, Haruka. During the Holy Empire Urquhart's civil war, he fights as a mercenary, demonstrating notable tactical acumen as a commander.

He marries Haruka Fujibayashi, a citizen of the semi-independent County of Mizuho, and Anna von Arnim, his childhood friend. Initial reluctance to marry Anna is overcome through pressure from Wendelin's wives. His wedding to Haruka faces sabotage attempts by Takeomi but proceeds successfully. Their first date occurs in Chapter 86 of the light novel, and they have children. Erwin endures frequent teasing by Wendelin's wives regarding his intelligence and participates in comedic situations, like applying sunscreen to Armstrong during a beach trip.