A digital person can look remarkably human and still add very little to the game. The more interesting question is whether the character can recognize the kind of experience a player wants and adjust its performance accordingly.
At Oddin Casino, we call this Adaptive Personality: a character that retains a clear identity while changing how that identity is expressed. Its energy, pacing, humor, conversational style, and level of interaction can respond to the player and the moment rather than remaining fixed from one session to another.