Discuss the character arc of General Leo here.

Who is he? What is he? What does he represent?

I'd like to take a moment and quote the foreword of The Fellowship of the Ring:

Quote Originally Posted by JRR Tolkein
I cordially dislike allegory in all its manifestations, and always have done so since I grew old and wary enough to detect its presence. I much prefer history, true or feigned, with its varied applicability to the thought and experience of readers. I think that many confuse 'applicability' with 'allegory'; but the one resides in the freedom of the reader, and the other in the purposed domination of the author.
...LEO LIVES