3. Lionel Luthor
Played by: John Glover
Appearances: 147 episodes (recurring – S1, regular – S2-7, recurring – S10)
… But certain other characters are just that bit more interesting. Like Lionel Luthor, for instance, Lex’s crooked father. Lionel is a fantastic villain for the show’s early years and his transition into a good guy and (third) father to Clark is brilliant too. John Glover is never less than electric in the role.
-1. Lois Lane
Played by: Erica Durance
Appearances: 141 episodes (recurring – S4, regular – S5-10)
Every Superman fan has their own favourite version of Lois Lane, and mine is Erica Durance. Smallville‘s Lois is feisty, funny and a force of nature and Durance is perfect casting. Her slow-building romance with Clark Kent is beautifully done and in the end she is made more important to the Superman legend than ever before.
-1. Lex Luthor
Played by: Michael Rosenbaum
Appearances: 156 episodes (regular – S1-7, guest – S10)
Likewise, Michael Rosenbaum is hands down the finest Lex Luthor the screen has ever seen. The first seven seasons of Smallville are every bit about the descent of a supervillain as much as they are the rise of a superhero. With some great writing and Rosenbaum’s always amazing performance, Lex is a sympathetic yet sinister anti-villain.
Fandom Factory 
Lana Lang or Chloe Sullivan should be #1.
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Both great characters!
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Alicia was a great character. A real shame the writers chose to kill her off. She understood Clarks feelings of isolation , loneliness , and being different better than Lana or Lois ever would.
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