0 (cont.):
According to Leibniz's monadology, each monad or substance expresses the entire universe from its own unique vantage point. A foil could act as a monad purposefully crafted to embody a perspective that is turning away from the perspective of a player's opposing monad.
Through this contrast between the subjective viewpoints of the player character and non-player character foils, certain latent aspects of the player's monad are elicited. The friction or discrepancy between these perspectives draws out internal potentialities, aspirations, or conflicts within the player's monad.
In this way, the foil serves as a conceptual counterpoint that stimulates the player's monad to express and unfold its nature. It functions as a dramaturgical device within the imaginary world of the game to actualize narrative elements that resonate with the player's subjectivity or will.
The foil provides an "outsider's glance" that helps the player's monad recognize its own unique essence. It acts as a conceptual mirror, revealing to the monad that which it could become, should choose to be, or desperately avoid being.