All characters in the Lord of the Rings are on a destiny. Many in this case are trying to protect their homes. While some are on their way to leaving a legacy. With Frodo. the ring barrer, come his companions and best friends Sam, Merry, and Pippin. In the case of the hobbits they are protecting the Shire. Aragorn is an heir and is on a destiny to protect all and prove what the can obtain while leaving a legacy. Gandalf on the other hand is living up to the power and the power that he consists of that is greater than seen on the surface. Each person selected to help on the journey is obtaining and learning something new about themselves. Legolas and Gmili's people are not all of friends but this journey brings them together.
Frodo being the ring barer learns a lot form hi father Bilbo, and also Gandalf. Bilbo gave Frodo the ring while Gandalf would not take it from him. This created the task of destroying the ring in Mordor, which the hobbits believe must be done to protect the Shire. Gandalf I believe made a wise decision in not taking the ring because the ring and the power it has over one person can change a destiny. For Frodo to over come what the ring so chooses he grows with every step on the journey. By not giving into the ring it makes it harder for it's master to find it, and rule them all. Frodo approaches this journey with the help of Dwarfs many others. Each other person contains their own destiny. They are all related to the ring in some way. Elves, , Kings, Wizards and all races are coming together to destroy the ring. In doing so i believe that a destiny could be to restore the old world back to it's great and peaceful beginnings before the shadows took over the land.
Destiny is not always presented but the tasks a character makes and chooses can shape a destiny and also provide what. What's a book without a task or a goal? How is it interesting if there are no errors? i believe every destiny approaches theses errors but in the end if a character really wants something they will do all they can to get it done. A destiny is something you decide so take it by the horns and get it done.