The ones to focus on remembering are the dangerous ones; some of the others have only run one or two games. If you stick close to one of us in a Game, we'll fill you in.
Something to remember, though, is that a Judge's name usually tells you something about their nature. King rules, Messenger loves communication, Mirror reflects, Librarian keeps the records. There are exceptions, and there are Judges whose names have changed over time, but you can often get a decent idea of their...theme, I guess, by looking at what they call themselves.