The Hobbit: The Case of Bilbo Baggins

Bilbo is a home loving and complacent hobbit that is very weary of danger. He screams ISTJ. Like most ISTJs,  "There is a lot more in him than you guess, and a deal more than he has any idea of himself." This quote, eloquently put by Gandalf, point to both the hidden strengths ISTJs have and the humility and lack of confidence very typical of them.

Frodo- INFP

Gandalf is an INTP. The P is obvious when he is compared to Saruman an obvious INTJ. When Gandalf tells Saruman about the Necromancer and the potential return of Sauron, Saurman is highly skeptical and assumes it is just a human dabbling in witchcraft. Gandalf is drawn to the innocent and weak Hobbits. He sees character strengths in people that are not visible on the surface. This is why he enlists the help of Bilbo and Frodo both of whom are physically incapable of dangerous combat.

Some more for funGimli- ESTP dwarfs are stereotypical Se users

Aragorn/ HE- ESTJ

Legolas-ENFJ

Thorin- ESTJ