The ring of power has a strange power to deceive people. There are many characters from "good" races who ring is successful to pollute their heart. Isildur, Sméagol and Boromir are among them. They are our gray characters. Obviously those who can show resistance in front of the power of the ring are our white characters. For example Galadriel, Gandalf and Aragorn deny the chances to catch the "precious" for their own. But what about Frodo? Is he really a white character?
Note that the ring finally deceives him and he is not the one who fell the ring into the fire (it was just an accident during his struggle with Sméagol). Also one of the final scenes shows Sam and Frodo in a corresponding situation with Elrond and Isildur after defeating Sauron during the great battle. So one can conclude that Frodo is just another Isildur in the present time. Beside Frodo we can see Samwise (the brave) who "never" wants the ring even when he has it in his hands. Note when the huge spider bites Frodo, Sam takes the ring for a while and give it to Frodo peacefully. So his character is whiter than other white characters because Galadriel, Gandalf and Aragorn avoid to touch the ring. They know if they touch it, the ring can deceive them easily.
Question 1: Who is our hero in this film? Frodo or Sam?
Question 2: Why does Frodo deserve immortality by going to undying land? Why is Sam not qualified for this journey?