Seran stands as the protagonist Kyle's steadfast companion and closest friend. A skilled swordsman, he fought in the Suicide Squad's assault on the Demon King's castle within the original timeline, directly contributing to the Demon King's downfall. His roots trace back to a shared childhood with Kyle and Liese in their home village. During the original timeline's Great Invasion, Seran perished when demons destroyed their village, an event that ignited Kyle's entry into the demon war. Following Kyle's time travel, Seran survives the village's initial demon attack due to Kyle's foreknowledge and interventions. He promptly joins Kyle's journey, becoming a core member of the group committed to averting the future catastrophe Kyle witnessed. In combat, Seran wields a historic sword renowned for slaying a prior Demon Lord three centuries earlier, its inherent properties proving exceptionally effective against demonic foes. He engages in pivotal battles alongside Kyle, including clashes where Kyle employs forbidden demon magic against him during training or conflicts. Interpersonally, Seran maintains straightforward dynamics, often provoking Liese with blunt remarks comparing her physique to women like Princess Mileina. These exchanges frequently escalate into comedic physical confrontations. Yet, unwavering trust and loyalty form the bedrock of his bonds with Kyle and Liese. His survival marks one of Kyle's earliest critical victories in reshaping history. Alive where he once fell during the castle assault in the original timeline, Seran actively aids Kyle's efforts to unite allies and prepare for the looming demon threat.