It seems that Zi Xing is not a prominently featured horse in the Romance of the Three Kingdoms novel. The name suggests a majestic horse, possibly purple in hue with a reddish tint, but without a specific role in the narrative, its significance remains ambiguous.

However, given Cao Cao's fondness for remarkable horses and their association with heroic figures in the novel, we can imagine Zi Xing as one of the prized steeds in his stables. Like other notable horses in the story, Zi Xing would likely have been a horse of great speed and reliability, perhaps serving Cao Cao in key moments of battle or in his campaigns across the land.