Emily Thorne, Jack Porter, Victoria Grayson and Nolan Ross are the only people to appear in every episode. Victoria Grayson was seen only through a new video clip sent to Emily in Season 4, Episode 21 (Aftermath), though.
The Brazilian telenovela Avenida Brasil (2012) shares a strikingly resemblance of storylines, which led to the Sony cable TV channel in Brazil to spoof "Avenida" in its "Revenge"'s TV promos, such as using the title theme on them.
In the last episode of Revenge, the year is 2015. Victoria died in 2014 where the rest of the season takes place and David died a year later, after spending time getting to know his daughter before the cancer took him.
Of the 14 regulars throughout the show's run, 7 of them are dead by the show's end. While Declan, Aiden, Conrad, Daniel, Ben and Victoria's deaths are all caused by another's actions, David is the only one who does not die by another's hand, but of an illness instead.