Laplace is a talking crow affiliated with Sefiro Fiore's Nagataki Branch, serving as counselor to branch head Etia Visconti. He offers guidance on organizational matters and operational protocols. Typically accompanied by the talking cat Schrödinger, Laplace assists in monitoring activities related to combating Daemonia threats.

He adheres strictly to an animal character design, lacking human-like traits such as defined hair color, eye color, or apparent age, and wears a distinctive bracelet. Laplace possesses significant knowledge about Daemonia and the Diabolos Tarot, occasionally revealing critical information to Elemental Tarot users. This includes informing Akari Taiyo about the villain Cerebrum's existence and motives following Luna Tsukuyomi's transformation, thereby reinforcing Sefiro Fiore's mission to eliminate such entities regardless of personal connections.

Maintaining a pragmatic stance, Laplace emphasizes the necessity of lethal force against Daemonia-possessed individuals, even former allies. He advises Akari that Luna, as a Daemonia, must be eliminated per organizational directives, highlighting his role in upholding institutional protocols. His interactions remain focused on strategic counsel without significant personal evolution or expanded background detailed across the series, light novels, or other media.