One of the frontiers of game AI is building agents that socially engage the player and each other in deep and dynamic ways. Traditional behavior-selection rules do not apply, while hand-scripted solutions do not scale and are often prohibitively brittle. Social and conversational beings require a deeper modeling of interests, drives, emotions, and an awareness of social norms. This lecture will show you architectures from three production games, Storybricks, Prom Week, and a game yet to be announced, that introduce new ways of constructing characters to allow deeper, flexible and more meaningful social engagement with the player.