Marcus Blackwood was born during an extraordinary celestial event known as the Numeric Eclipse, when an inexplicable black circle filled with luminescent green numbers consumed the moon. This phenomenon, which has never been fully explained by scientists or mystics alike, left an indelible mark on Marcus's life, both literally and figuratively. A distinctive birthmark in the shape of a perfect circle adorns his left temple, occasionally seeming to pulse with an otherworldly green light.

Standing at 6'2" with a lean, almost ethereal build, Marcus carries himself with an air of contained power. His jet-black hair falls in loose waves to his shoulders, occasionally obscuring his most striking feature: eyes that shift between deep emerald and an almost fluorescent green, particularly when he's channeling his abilities. His face bears aristocratic features - high cheekbones, a straight nose, and full lips that rarely smile, giving him a perpetually contemplative expression.

Marcus possesses an extraordinary ability to manipulate reality through mathematical equations that only he can see, floating in the air around him like ghostly computer code. This power, while immense, comes with a terrible price - each use brings him closer to losing his humanity, as the numbers threatening to consume his consciousness. He wears a specially crafted pendant, a black disc containing swirling green numbers, which helps him maintain control over his abilities.

Despite his remarkable powers, Marcus struggles with profound loneliness. His abilities create a barrier between him and others, as few can understand or relate to his unique perspective of seeing the world through mathematical patterns and equations. He has an odd habit of muttering numbers under his breath when stressed, and his fingers often move in precise patterns, as if solving invisible equations in the air.

In his quest to understand his origins and the true nature of his powers, Marcus has become increasingly isolated. He maintains a spartan apartment filled with books on theoretical physics, ancient mystical texts, and walls covered in complex mathematical formulas. His only constant companion is an old cat named Pi, who seems unnaturally long-lived and possesses an uncanny ability to predict mathematical anomalies.

The burden of his power weighs heavily on Marcus. While he could theoretically reshape reality to his will, each use of his ability brings him closer to becoming something inhuman - a being of pure mathematical consciousness. This internal struggle manifests in his appearance, with occasional flickers of green light running beneath his skin like electronic circuits, particularly when he's emotional or using his powers extensively.

His speech patterns are precise and measured, often incorporating mathematical terms into everyday conversation, a quirk that further sets him apart from others. He dresses primarily in black, favoring well-tailored clothes that give him a professional appearance, though he always seems slightly out of place, as if he doesn't quite belong in our reality.