Chloe Anne Sullivan
Justice League member
Oliver Queen (current)
Jimmy Olsen (ex, deceased)
Portrayed by the lovely Allison Mack, Chloe was one of the most important characters on Smallville. She was Clark Kent's oldest and closest friend, and throughout the series served as his connection to other DC Comics icons who appeared on the show. The most important of whom was her cousin, Lois Lane, who would become Clark's wife.
Chloe was the only character, besides Clark, who appeared in every season of the show; they were also the only two who were credited as main characters throughout the entire series. Chloe appeared in a total of 201 out of 218 episodes; appearing in more episodes and having more screen time than any other character, besides Clark. Chloe has also "died" more times than any other character on the show, a total of eight times.
Although Chloe had never appeared in the comics, as she was an original character created just for the show, she quickly became a beloved favorite, and in the series finale the show creators decided to give her the honor of being the only character in the entirety of the series to call Clark by his legendary moniker, "Superman".