|Characters are in two groups; there is also a quick check page for each season for fact checking purposes.|
Main Characters are just what they sound like; the characters seen each week, or at least most weeks of the series.
Recurring Characters are defined as guest characters seen in at least two episodes
Character Information by episode character developement as listed on individual episode pages, for those times you just need a quick check.
Character pages do contain spoilers for the series, you have been warned!