The Wikipedia overview: Four temperaments is a proto-psychological interpretation of the ancient medical concept of humorism and suggests that four bodily fluids affect human personality traits and behaviors. The temperaments are sanguine (pleasure-seeking and sociable), choleric (ambitious and leader-like), melancholic (analytical and thoughtful), and phlegmatic (relaxed and quiet).
And then some stuff on the temperaments themselves:
The sanguine temperament is fundamentally sociable and pleasure-seeking; sanguine people are impulsive and charismatic. They tend to enjoy social gatherings, making new friends and tend to be boisterous. They are usually quite creative and often daydream. However, some alone time is crucial for those of this temperament. Sanguine can also mean sensitive, compassionate and romantic. Sanguine personalities generally struggle with following tasks all the way through, are chronically late, and tend to be forgetful and sometimes a little sarcastic. Often, when they pursue a new hobby, they lose interest as soon as it ceases to be engaging or fun. They are very much people persons. They are talkative and not shy. Sanguines generally have an almost shameless nature, certain that what they are doing is right. They have no lack of confidence. Sanguine people are warm-hearted, pleasant, lively and optimistic. They have been called "people-oriented extroverts."
The choleric temperament is fundamentally ambitious and leader-like. They have a lot of aggression, energy, and/or passion, and try to instill that in others. They are task oriented people and are focused on getting a job done efficiently; their motto is usually "do it now." They can dominate people of other temperaments with their strong wills, especially phlegmatic types, and can become dictatorial or tyrannical. Many great charismatic military and political figures were cholerics. They like to be in charge of everything and are good at planning, as they can often immediately see a practical solution to a problem. However, they can quickly fall into deep depression or moodiness when failures or setbacks befall them. They have been called "task-oriented extroverts."
The melancholic temperament is fundamentally introverted and is given to thought. Melancholic people are often perceived as very (or overly) pondering and are both considerate and very cautious. They are organized and schedule oriented, often planning extensively. Melancholics can be highly creative in activities such as poetry, art, and invention – and are sensitive to others. Because of this sensitivity and their thoughtfulness they can become preoccupied with the tragedy and cruelty in the world and are susceptible to depression and moodiness. Often they are perfectionists. Their desire for perfection often results in a high degree of personal excellence but also causes them to be highly conscientious and difficult to relate to because others often cannot please them. They are self-reliant and independent, preferring to do things themselves to meet their standards. One negative part of being a melancholic is that they can get so involved in what they are doing they forget to think of other issues. Their caution enables them to prevent problems that the more impulsive sanguine runs into, but can also cause them to procrastinate and remain in the planning stage of a project for very long periods. Melancholics prefer to avoid much attention and prefer to remain in the background; they do, however, desire recognition for their many works of creativity.They have been called "task-oriented introverts."
The phlegmatic temperament is fundamentally relaxed and quiet, ranging from warmly attentive to lazily sluggish. Phlegmatics tend to be content with themselves and are kind. Phlegmatics are consistent, they can be relied upon to be steady and faithful friends. They are accepting and affectionate, making friends easily. They tend to be good diplomats because their tendency not to judge and affable nature makes reconciling differing groups easy for them. Phlegmatics prefer to observe and to think on the world around them while not getting involved. They may try to inspire others to do the things which they themselves think about doing. They may be shy and often prefer stability to uncertainty and change. Their fear of change (and of work) can make them susceptible to stagnation or laziness, or even stubbornness. They are consistent, relaxed, calm, rational, curious, and observant, qualities that make them good administrators. They can also be passive-aggressive. They have been called "people-oriented introverts."
The only one really jumping out at me is Sanguine for Courfeyrac and possible Melancholic for Prouvaire. I'm also thinking maybe Choleric for Enjolras.