Xiao Hei is the small black cat-like spirit and main protagonist of Luo Xiao Hei Zhan Ji. Curious, gentle, and initially naive about the human and spirit worlds, he begins as a wandering creature after losing his home. Throughout the series, he grows through friendship, conflict, and self-discovery, often serving as the emotional center of the story. His role is to bridge different worlds and explore themes of coexistence, identity, and belonging.