This anime series features the reincarnated Demon King Anos Voldigoad, who, after sacrificing his life 2000 years prior for peace, finds himself labeled as an outcast upon enrolling in an academy created to identify his successor, due to his overwhelming and misunderstood power. What is this series called?

The anime series described, featuring a powerful reincarnated Demon King named Anos Voldigoad who is misunderstood and labeled an outcast in an academy designed to find his successor, is indeed The Misfit of Demon King Academy (Review). This title perfectly encapsulates the central premise, as Anos, despite his immense original power and self-sacrifice for peace 2000 years prior, finds himself an anomaly in a world that has forgotten true magic and demon capabilities. His overwhelming strength is often mistaken for weakness or incompetence by the academy's faculty and students, who are accustomed to a diluted form of magic.

The series delves into Anos's journey as he navigates this new era, often effortlessly overcoming challenges that baffle his peers and teachers, all while trying to restore peace and uncover the truth behind the historical inaccuracies surrounding his past. His interactions with both allies and adversaries highlight the stark contrast between ancient, true demon magic and the contemporary, often superficial, understanding of power. This blend of action, fantasy, and a touch of comedy, as Anos nonchalantly demonstrates his god-like abilities, makes for an engaging narrative.

The Misfit of Demon King Academy originated as a web novel series, later adapted into light novels and manga before gaining significant popularity as an anime. It is a prime example of the "isekai" subgenre, where a protagonist is transported or reincarnated into another world, often possessing unique or overpowered abilities. The show's appeal lies in its exploration of themes like identity, legacy, and the often-misguided perceptions of power, all through the lens of a protagonist who is consistently underestimated.