Schemer
A schemer is a person who devises and pursues plans to achieve certain ends, often by manipulating others or concealing their true intentions. The term tends to carry a negative or pejorative connotation, signaling cunning or subterfuge rather than straightforward honesty. In neutral use, it can simply denote someone who is planning or plotting, though its use generally implies that the plans involve other people's cooperation or exploitation.
Among fiction and drama, schemers are common antagonists whose plots drive the narrative. A classic example
Related terms include plotter, intriguer, conspirator, and manipulator. Distinctions exist between a schemer and a strategist: