Abby’s a favorite because she’s just plain fun. This tattooed character hardly looks like the lab expert we’d find in a federal lab. Few other women could pull off this Goth-attired look and still win hearts. But her skills have earned her a reputation that surpasses other investigators. Her reputation caused a killer to stalk her on the sister show, NCIS-LA. She constantly surprises us with hidden details of her life, the ability to sign (saving her life in the stalking episode), bowling with nuns, sleeping in coffins, etc. And her enthusiastic affection and fierce devotion for her fellow team members makes her a winning character.