From the official Wikipedia page: "A breakout character is a character in serial fiction who becomes a more prominent, popular, discussed, and/or imitated individual." Let's hear it for the guys who weren't really the main characters, but still became irreplaceable parts of the shows they were on.
  1. Ben Linus, Lost
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    Evil Ben came out of nowhere and then became one of the weirdest anti-heroes on the show.
  2. Brienne, Game of Thrones
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    Honorable badass
  3. Stewie, Family Guy
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    "Mom. Mom. Mommy. Mama. Mom. Lois."
  4. Roger, American Dad
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    "Cocaine is not a joking matter."
  5. Andy, Parks and Recreation
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    Ohhhhhh pre-mega-fame Chris Pratt
  6. Tina, Bob's Burgers
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    That time she dated a ghost in a shoebox really sealed the deal for me.
  7. Kate McKinnon, Saturday Night Live
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    "I'm Martha F*cking Stewart, I can do whatever I want."
  8. Aidy Bryant, Saturday Night Live
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    She's as Morgan as she can be right now.
  9. Carol, The Walking Dead
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    From victim of domestic violence to slightly sociopathic badass vigilante, Carol has been through some shit.
  10. Erin, The Office
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    Not necessarily my favorite character on the show bc I haaaaated her and Andy, but I love how she evolved from a replacement receptionist into this:
  11. Toph, Avatar: The Last Airbender
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    Absolute, undeniable, blind badass. And she's like 12.
  12. Macey Hensley, The Ellen Degeneres Show
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    I know this probably doesn't count because she is a real person, but #bless this child.