Ben, Tom, & Juliette
Sawyer, Kate & Jack

Ben & Sawyer- each are con men who push peoples buttons. Both like being in control.

Tom & Kate- Rough when needed to be nice when they want to be. Both follow orders.

Jack & Juliette- Doctors, sympathetic, protaganists. Both want control.

Not implying any romantic or other ties just similarities in the characters.