I have been reading about angels in a new book by Donald Parry called Angels: Agents of Light, Love and Power. He mentions this angel who visits Alma, the Younger. His name is withheld but he comes many more times to Alma, one example being when he leaves Ammonihah the first time. He was called to warn, guide, and minister.
I so appreciate the return of Alma. He becomes an amazing missionary and fulfills the request of the angel to remember the bondage of his forebears. His message to the cities where he preaches is one of sincere repentance.
You can find this overview of the missionary journeys of Alma and the sons of Mosiah, here.
In this section we meet Ammon, a son of King Mosiah, who is daring, converted, and sure of his mission to bring salvation to the Lamanites.
You can find more of my thoughts on these blocks of scripture here and here.
My illustrations, weak as they are, can be downloaded here.