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"We are the Kids Next Door, Numbuh 4! We save kids. That's our job."
— Numbuh 5 to Numbuh 4
Abigail "(Abby)" Lincoln a.k.a. Numbuh 5 is the intelligent, relaxed African American/French girl second-in-command/spy in Sector V. She became a KND operative three years before the show started as shown in Operation: M.A.U.R.I.C.E.. She was trained by her older sister, Cree (Numbuh 11), and joined her sister, Numbuhs 8a and 8b, and Numbuh 9 in Sector V.
Numbuh 5 is described as the intelligent, laid-back, witty, quick-thinking, cool, calm, crafty, clever, responsible, book wise, and streetwise agent of Sector V and the only one with true common sense. Like Numbuh 1, she is the only member of her team that takes her missions seriously. To go along with her cool personality, Numbuh 5 is the only character in the show that speaks in third person, saying "Numbuh 5" instead of "I" most of the time. Not only is she the smartest of her team, but one of the smartest students at Gallagher Elementary School, where she is a honor student.
Unlike her teammate Numbuh 3, Numbuh 5 is very tomboyish, not having any actual interest in anything girly, such as Rainbow Monkeys and often seen in tuxedos rather than dresses. (Although in Operation: L.I.Z.Z.I.E. Numbuh 4 complains about her "stupid girl magazines.") However, like Numbuh 3, she is considered rather attractive as shown in Operation: R.O.B.B.E.R.S., when a member of the Six-Gum Gang tries to flirt with her, but fails since Numbuh 5 has no real interest in boys. However, in Operation: M.A.U.R.I.C.E., she is shown to have a crush on Numbuh 9 ever since she was younger and was the only one to have knowledge that Numbuh 9 wasn't decommissioned.
Like her teammates, Numbuh 5 distrusts teenagers and adults, having a fierce rivalry with her sister, Cree Lincoln, who taught her most of her skills. In Operation: M.A.U.R.I.C.E., she expressed her anger of becoming a teenager to a point where she yelled at Numbuh 3 when she questions her about her birthday. After Maurice (Numbuh 9) informs her that she may be able to join him in the Teen Operative group of the KND after her 13th birthday, her anger subsided and was reassured.
In Operation: D.I.A.P.E.R., Numbuh 5 has a motherly side to her and acts like a big sister figure to most of her teammates throughout the show. It was revealed in the same episode that Numbuh 5 has a brilliant singing voice and in Operation: M.A.C.A.R.R.O.N.I., she is also very artistic. Also, she seems to know most about Numbuh 4's crush on Numbuh 3, as she teases him about it along with Numbuh 2.