Even though he is a mercenary, he is well-read, and seems to have much knowledge on worldly events and other things, like science, literature, and more. There is more to him that it seems, perhaps he is hiding something.
Jim likes nothing more than having a mug of beer with friends, cracking jokes and whiling away the time with his buddies. He may be smart, but that doesn't mean he sometimes make stupid mistakes. These mistakes often come in the form of his tongue slipping and mis-matching words. Kinda like wanting to say 'Chasing dreams' but saying 'Dasing cheams' instead. That's what makes him funny.
Other times, if you're conversing with him normally, he will sometimes compare the events that have happened recently to things that have happened in history that are similar. He enjoys doing this, as it keeps his mind active and alert, as well as keeping his memory fresh.
His equipment includes:
A FN FAMAS assault rifle, chambered with standard NATO 5.56mm rounds in a 30 round magazine.
A SIG-Sauer P226 9mm pistol, 15 round magazine.
An army-issue combat knife.
An extensive history of martial arts practice.
A latent ability (that has yet to be uncovered) that is sometimes activated by the tattoo on his chest. These latent abilities include extreme speed, near-impossible aiming skills and agility that surpasses even the best martial artists and free-runners. The downside of this is that he doesn't even know how to activate these powers, they come on at random times, or sometimes not even when he needs them.
He became a mercenary after his military training, after he discovered his family mysteriously murdered by individuals unknown. Taking two guns and a history of cruel treatment by his superiors, he offered his services as a gun-for-hire.