She's the most chill and level-headed of Sector V, and the only one with true common sense.
Whilst arguably not as skilled a fighter as Numbuh's 1 and 4, she's still a fearsome opponent, she is also far savvier in combat than the latter, often using a great level of ingenuity to defeat her opponents.
She has a motherly side to her and acts like a big sister figure to most of her teammates throughout the show, best shown in Operation: D.I.A.P.E.R.
The same episode mentioned above shows she also has a brilliant singing voice.
Operation: M.A.C.A.R.R.O.N.I. shows that she's very artistic.
It's shown in Operation: S.P.A.C.E., that despite Cree being her sister, she isn't above tricking her to save her teammates. Although throwing her into the Trash Chute was apparently part of the latter's plan all along.
She never gave up on Henrietta after she was turned into Heinrich, and continued to try and turn her back to the good side until she succeeded in Operation: C.A.R.A.M.E.L.
Operation: I.N.T.E.R.V.I.E.W.S. shows that after Numbuh 1 left for the Galactic KND and Numbuh 362 retired, she became the Supreme Leader of the KND.
Her obsession with sweets is so strong, she ended up risking her life to get a taste of the fourth ice cream flavor.
Operation: M.A.U.R.I.C.E. had her lashing out at Numbuh 3 when the latter brought up her Birthday, due to the her fear and hatred of the thought of becoming a teenager.
The earlier season had entire episodes where she'd barely even speak. Luckily, by the end of the show, she's gone from having little to no impact on the story, to becoming the deuteragonist of the show.
She and Numbuh 2 are the only members of their sector who have American-style accents.
She has also been temporarily delightfulized in Operation: D.A.T.E.. Her delightfulized look was similar to the braid girl. She also wears glasses while delightfulized and in the pilot, indicating that her eyes may have an impediment.
Operation: I.N.T.E.R.V.I.E.W.S. shows she married Numbuh 2 in the future.
Abby and Vin Moosk are the only characters to refer to themselves in the third person, though Abigail refers to herself by her code name.