Seeley Booth is a former sniper with the U.S. Army Rangers. He now works with the FBI and alongside the team led by Dr. Brennan.
At first, Booth was not happy to act as a liaison between the FBI and the Jeffersonian Institute. But he eventually developed personal and professional chemisty with Bones. They now with a top notch crime-fighting unit.
Booth is an ideal complement to Bones' speciality in science. He's intuitive and knows how to read people.
Hodgins: Where's your chest hair?
Booth: I'm highly evolved!
Brennan: His pubic extension is entirely within normal --
Booth: Okay! Enough!
Sweets: But still, to face a pack of wild animals alone...
Booth: I'm sure you could just bore them to death with your shrinky talk.