Jack is a straight shooter. If he likes you, he likes you but if he hates you, you don't have much chance of changing his mind.
Although his is a typical solid male Jack really has no interest in violence. This is a lion that enjoys the simple things and because of this he is looked down upon as weak by other males even though he is a match for them physically.
He has a level head on his shoulders and is a great one for reasoning over an argument before it turns messy this has put him in line for the throne but he has no inclination to rule a kingdom. Jack is a daydreamer and a romantic but only has eyes for one, who he's too bashful to tell of his true feelings.
