Emet-Selch

[Baalfrog]

Or perhaps it's the: 'dedicating the rest of his life to doing what he feels to be best for his people, even thousands of years later, in the hope that he might one day see them again' bit that was omitted from your list?

You don't have to agree with a character to be able to sympathise and relate to them.

He was a tempered madman, thats why he cared so much instead of becoming apathetic and cynical old man like immortals overtime should become.