All types. But astronomers tend to be a very private lot. We hardly ever talk about our private tastes in music, entertainment, lifestyles or social condition. We almost exclusively talk about research, the career, how to do a particular calculation, or debug a program.
I guess the non-astronomer or non-scientist would find the workplace of an astronomer outwardly VERY BORING. We sit in our office starring at a screen full of program code, text from a paper we are writing, or a color image of some part of the sky, and we do this in complete silence. And we enjoy this work enough to keep doing it year after year.
The types of people, well, I guess you would say we are all perfectionists who are fanatic about accuracy and being quantitatively correct. There is little vague or sloppy talk, and we tend to use our analytical skills to sometimes try to analyze very non-analytical situations. We are very competitive, and often not in a collaborative way. Although we sometimes get together to coauthor papers, we are always conscious of what the present work can get us later in terms of career advancement and career stability. We are committed to publishing results quickly, and getting as many papers published each year as the nature of the work allows. Everyone is pretty aggressive about discussing their own work, and keeping the work in the public eye so that it doesn't get forgotten.