His eyes were permanently narrowed, always suspicious, never relaxing. Her eyes danced but constantly reflected the horrors she had experienced, never releasing their haunted, hunted shadow.
He carried the weight of his shattered childhood around with him. She found small solace in the moments of happiness she could remember but could never let go of the burden that had come as a consequence of her childhood.
He had no family at all. She had a wreckage of a group that could once have been called a family: her sister blown to smithereens in a side street somewhere in Israel, her brother with her bullet through his skull and her father who could easily have been carrying the guilt of her paternally inflicted death around with him.
He knew Gibbs from deep in his past and had earned his respect through mutual pain and aptitude. She gained Gibbs's mistrust initially but secured his mostly unwavering confidence in the second that she saved his life by murdering her brother.
He had no firm belongings or attachment but was a nomad, disappearing underground and becoming someone else to complete his mission. She had two loyalties; Mossad and NCIS, and found it hard to make the choice between the two; family or friends but when she joined NCIS she claimed to have had enough wandering and had found the desire to settle down.
He had suffered greatly on many emotional levels and his eyes and actions mirrored that. She had been physically tortured and mentally broken but she locked all the pain away and rarely allowed it to surface.
He could take teasing about his weaknesses and joined in the laughter. She passed out sexual innuendos and flirting but nobody joked about her skeletons or barely cold corpses.
He knew his partner inside out and the mocking was light hearted. She had deep seeded issues with her partnership and their banter sometimes bordered on merciless.
He lived in many places and never stayed in one place. She had two homes and her response to one being blown up was indifferent and cold.
His love life never interfered with work and there was little sexual tension between him and anyone else to stifle the atmosphere for others. She had a strong sexual bond with a colleague which could make a room uncomfortable, sometimes drove a wedge in between them and their work and, when she found someone else, someone who was interfering with her ability to be impartial to their suspects, caused her to abandon her job.
He risked his life for his job, becoming other people and dealing with their issues. She risked her life for her father and was saved by her old job and her old associates at work.
He escaped his life through his work, shedding his own skin and sliding neatly into other's. She fled her work to find solace in a stable, caring job, letting her heartless, callous self die and the sensitive under layers shine through.
He never met her and so they never realised their similarities.