Hufflepuff

Hufflepuff Virgos are incredibly hard workers and bright, if quiet, students. They excel at any magical arts related to domestic life or healing. They must be watched carefully to ensure that they do not overstress their systems by performing too much work; these wizards have a very hard time learning the meaning of the word "no," and are thus easily taken advantage of for their work ethic. Let other people do the leading and the decision making; they are content to serve. And on their backs rests the industry of the world. Without people like them, civilization might grind to a halt, for who would take care of the practical details?

Ravenclaw

Ravenclaw Virgos are skeptical, analytical, mathematically oriented, and sharp witted. Many become great magi, alchemists, and astrologers. These people love ideas and theoretical discussion, and their leaps of intuition can be uncanny. The Earth element makes them shrewd and pragmatic, and keeps them from flying off into cloudcuckooland.

Slytherin

While these Slytherins might not be the most outgoing of their class, they are often among the most wise, and their canny observation and lightning-fast analysis of any given situation will take them far. Often behind that quiet mien hides the mind of a big dreamer, who had both the imagination to come up with a concept and the power to follow it through. These Slytherins are an interesting mix of politeness and politics, pragmatism and intuition. They make good alchemists, Ministry bureaucrats (well, somebody's got to do it), and academic advisors. They are often underestimated. This is most unwise.