YF-23 Black Widow II Chan is the human embodiment of the Northrop YF-23, an experimental stealth fighter created for the United States Air Force’s Advanced Tactical Fighter competition.

She was designed to be fast, stealthy, efficient, and difficult to detect. She possesses an unusual combination of graceful curves and severe angles: a smooth, flowing body paired with sharp, diamond-like wings and widely canted tail surfaces. Her appearance reflects that same design philosophy. She is physically elegant and gently curved, but everything she wears and every movement she makes carries an unmistakable precision.