About Gibbs and Abby
About Gibbs (Portrayed by: Mark Harmon)
A former marine, Gibbs is a consummate organizer, disciplined and demanding of his A-team often standing between them and pressure from other authorities. Though a demanding boss everyone respects, he takes an interest in their personal struggles and watches over them like a hawk. The team is more like a group of highly-specialised children to his father-figure.
Gibbs has been married and divorced three times and once had a romantic relationship with the now deceased director of NCIS, Jenny Shepard.
He is a dedicated coffee drinker, a fact played out with his team setting up someone to innocently drink or spill his coffee, incurring Gibbs' ire. In one episode when McGee drinks Gibbs' coffee unawares, an on-base security officer explains that rule #23 is "never to come between a marine and his coffee".
Simple descriptions of the 2, taken from Wikipedia until I can write something more.