In Four Humours, you are a doctor in medieval times, and everyone knows that your personality is determined by an imbalance of your bodily fluids, a.k.a., the four humours: Choleric (Yellow bile) - Goal-oriented, decisive, ambitious. Sanguine (Red blood) - Talkative, enthusiastic, social. Melancholic (Black bile) - Analytical, detail-oriented, reserved. Phlegmatic (White phlegm) - Relaxed, peaceful, easy-going.