First meet Hein in FF3 as boss that has imprisoned a town and has taken the great fairy tree and turns it into a flying castle. He isn't really a huge part of the story more like a side boss.

Amon you find in the endgame dungeon in FF3 and looks pretty much the same as Hein but just reskined. He protects the throwing weapon "Rising Moon".

This character is hardly a character because of what he does in FF3 and he is not even mentioned in any other FF. This is a good thing for FF14 which they can now create him into a decent character one we can even remember well and not think hes Kefka, gogo or gilgameish just because how hes dressed.