I think that Ammon is a good example of humility. Aside from the fact that he gave up his rights as a Nephite prince, and willingly became a servant to a Lamanite king, he has to know that what he just did when he decimated the thieves who were trying to scatter the king’s flocks (sheep rustlers) is so many levels of awesome that it pretty much put him into superhero status. But he doesn’t stand around gloating or basking in the glory of it, he just gets to work on the next job he’s supposed to do. He keeps a true servant’s focus even when everyone else gets distracted.
Alma 18:8-9, Book of Mormon –
“And it came to pass that king Lamoni inquired of his servants, saying: Where is this man that has such great power? 9 And they said unto him: Behold, he is feeding thy horses. Now the king had commanded his servants, previous to the time of the watering of their flocks, that they should prepare his horses and chariots, and conduct him forth to the land of Nephi; for there had been a great feast appointed at the land of Nephi, by the father of Lamoni, who was king over all the land.”