Abigail Baker - Blue Bloods
As the principal aid to the Police Commissioner, Frank Regan, Abigail doesn't have a big role, but an important one. "The Comissioner has left the building." She's also played by Abigail Hawk for bonus Abby points!
Bunster

How could they forget Abigail Borin (Bibbs)?

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abby lockhart !! ER

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Coastie Abigail Boren.

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No first lady Abby Bartlett from The West Wing. For shame!

Modwild
@ chipramsey

That would be a "blast from the past" Abby. These are all the current characters. Or, current through this past season! :-)

NCIS Quotes

McGee: Rule number 70 - keep digging till you hit bottom.
Abby: McGee! There is no rule 70.
McGee: Well, I--
Abby: You just made up a rule. This McGibbs thing has really gone to your head. I don't even recognize you right now.

[voiceover] Anyone can achieve their fullest potential, who we are might be predetermined, but the path we follow is always of our own choosing. We should never allow our fears or the expectations of others to set the frontiers of our destiny. Your destiny can't be changed but, it can be challenged. Every man is born as many men and dies as a single one.

McGee