Sebastian, a young man in his mid-twenties, hails from the bustling underground city of Veridian, a place where the sun's rays never touch the cobblestone streets. His hair, a tangle of dark curls, often falls into his piercing green eyes, a trait inherited from his mother, a renowned acrobat known for her daring feats. His father, a charismatic juggler, passed down to him a lean, agile frame perfect for the life of an entertainer. Yet, Sebastian chose a different path, driven by the harsh realities of his lower-class birth and the desire to protect his large family of five siblings, three older and two younger, all sharing the same cramped living quarters beneath the city's surface.

From a young age, Sebastian attended the prestigious Academy of the Blade, a rare opportunity for someone of his station. There, he honed his skills in combat and strategy, learning to wield a variety of weapons and to think tactically. His training was intense, shaping him into a disciplined fighter, but it was his encounter with The Hunter, a solitary figure who roamed the outskirts of Veridian, that truly transformed him. She taught him the ways of survival and the reverence for nature, instilling in him a deep connection to the world above.

Sebastian's life took a dark turn when he was pressured into a decision that led to the downfall of a fellow student, a notorious scoundrel. The guilt of this act haunted him, a secret regret that he carried silently, fearing it would tarnish his reputation and hurt his family. This event fueled his determination to rise above his circumstances, to become someone who could not only protect but also provide for his loved ones.

Now, as a skilled fighter and strategist, Sebastian navigates the complex social and political landscape of Veridian. His unique quirk, a habit of tapping his fingers in a rhythmic pattern when deep in thought, often betrays his restless mind. Despite the conflicts in his life, from his secret regret to the constant struggle against the city's oppressive hierarchy, Sebastian remains a beacon of hope and resilience, a testament to the power of determination and the will to change one's fate.