Across thousands of Imperial worlds, Vilani tend to share certain common traits. Even Vilani khagarii have the same basic psychology.
Tradition
Vilani are devoted to tradition. Whenever a Vilani must make a decision, his first thought is usually given to what other Vilani have done in similar situations, what the customs of his family and caste require, and soon. Vilani rarely rely on their own initiative to solve problems, and can struggle when the situation is genuinely new. On the other hand, Vilani gain confidence from the vast body of tradition they can draw upon. Creative and innovative thinking are strongly discouraged by Vilani society. Those who insist on applying new ideas are regarded as a danger to society, attacking the traditions that hold civilization together. A Vilani who persists in being innovative is often treated as criminally insane. Tradition covers Vilani technology, standardizing it almost everywhere in the Imperium. Tradition also freezes Vilani technological development in place; the standard Imperial toolset has seen no significant changes in over 2,000 years. Vilani art, music, and literature are also firmly grounded in tradition – a present-day Vilani artist will often produce works in a style thousands of years old.
Pragmatism
No matter their caste or subculture, the Vilani are very pragmatic people. They don't waste time on abstract theories or unattainable ideals – they are interested only in doing what works. To them, the real universe is much more important than the world of ideas. Vilani are administrators and engineers, not philosophers or scientists. To some extent, Vilani pragmatism is related to their insistence on tradition. Methods, technologies, and ideas become traditional once they have been proven to work over long periods of time. Vilani innovators are regarded as dangerous because they proceed without being able to prove that their innovations will do more good than harm.
Community
Vilani are strongly community-oriented. Vilani are certainly capable of individualistic behavior, but their society trains them to always measure their actions by their effect on the community. A Vilani defines his self-image in the context of his family, his caste, his work team, his home city, his home world, and the Imperial system as a whole. He regards his prosperity as depending on that of the group. He expresses his ambitions by demonstrating that he is better able to advance the group's interests than anyone else. One expression of this group thinking is the Vilani attitude to work. Vilani are diligent and efficient workers. A Terran might expect to spend a third of his day on the job; a Vilani thinks nothing of spending half of his day, and will often work longer hours than that. Vilani enjoy their recreational time, but to them life isn't about having fun – it's about working hard to make the community healthy and prosperous.
The Vilani prefer communal decision-making. The notion of the autocrat, the lone decision-maker who is subject to no other authority, is alien to Vilani thought. Even the Vilani Emperor is simply the chair-man of the ruling council of the Imperium. At all levels of Vilani society, from the Imperium down to the single family, decisions are reached by groups who meet and work out consensus. The process is often slow, but once a decision is reached it has the committed support of all members of the group.
Vilani communities are held together by codes of courtesy; these codes can be extremely elaborate, especially among the "High Vilani" castes that fill out the aristocracy and the ranks of senior administration. Vilani courtesy helps maintain harmony within the community, and helps individuals to keep their expression of emotion within the bounds set by tradition. Even bitter enemies are unfailingly polite to one another when they must interact socially.