The Idea of Responsibility in the Fellowship

When I initially think about who holds the most responsibility in the original nine members of the Fellowship, my mind immediately goes to Frodo, since he has voluntarily taken it up himself to be the Ring Bearer. The weight of this responsibility and duty that Frodo feels is almost physically hindering to him since he must act selflessly in order to fulfill his quest. We see this when he decides to depart from the Fellowship to complete his journey to Mordor alone, despite him knowing the road holds inevitable danger and he is not quite sure of his path. 

However, his lonesome journey is foiled by another character in the Fellowship who also stays true to their promises and responsibilities: Samwise Gamgee. One of the most obvious characteristics of Sam is his undying devotion to his master. He takes it upon himself to ensure the safety of Frodo's wellbeing and it is because of this intense feeling of responsibility and love for Frodo that he chooses to leave the relative security of the Fellowship to go with Frodo to destroy the Ring. 

Besides these two Hobbits, another figure in the Fellowship that was recognized to hold a great deal of responsibility was Gandalf, as he was the one who was knowledgeable about the paths they should take and what danger may lie ahead of them. 

After he falls into the depths of Moria, that responsibility for the guidance of the Company is passed to Aragorn, who feels this burden of responsibility heavily. In the first chapter of The Two Towers, after Aragorn finds Boromir dead, he is distressed and holds himself accountable for the breaking of the Fellowship. Thus, it seems to me that these four characters (Frodo, Sam, Gandalf, and Aragorn) shoulder a great deal of responsibility and hold themselves accountable to their duties, making them admirable figures in the story.