The Righteous act because they listen to their conscience, they love the others, the beauty of life, but they always pay some price in their life due to their love and therefore we have to publicly express our gratitude to their role.
An exhaustive class of Righteous will never exist, because throughout history and in different contexts, new individuals constantly appear, who can anticipate the course of events with their conscience and their judgement.
Are there however common characteristics to recognize the Righteous?