The Alter form is presented in a dramatic, forward-leaning pose that radiates urgency and power. The figure is dressed in dark, intricately sculpted armor with gunmetal base tones, accented by crimson lines and silver highlights that trace each plate. A flowing cape waves behind him, enhancing the sense of motion and heroism. Fine weapon details are visible, with layered gauntlets, segmented cuirass, and a sharp, imposing spear gripped in one hand while the other rests near the belt. The face combines steely resolve with a hint of feral intensity, framed by windswept hair. Overall, the sculpt conveys a brooding, battle-hardened charisma designed for a commanding display.

Cu Chulainn Alter is the darker, corrupted reflection of the famed hero Cu Chulainn within Fate/Grand Order. Once celebrated for courage and loyalty, his Alter ego rises when pride and desperation push him beyond mercy, turning his power inward into a relentless, ruthless force. He strides through conflicts with a merciless resolve, challenging rivals and even comrades as fate threads around him. His story explores how noble ideals can be twisted by fear and ambition, forcing him to confront the consequences of wielding such dangerous strength and the possibility of redemption through struggle.