(SPOILER)When all the characters are celebrating the Emperor's defeat, many of them vocalize their hopes and plans for the future. Leon however decides to leave because of his past deeds into seclusion, even though his sister begs him to stay. There is a reference that he might return someday when he is ready.
This actually sounds a lot like Frodo from The Lord of the Rings.
Leon turns to the dark side, and then he doesn't want to stay with his friends because of his regretting his deeds.
It's so much like Frodo.