I have the basics set up for the other three Elemental Lords. Now I just need to spruce them up, get them into a Skillbook and get them into the game.
Edit:
Now that I am thinking about it, I think it might just be a better idea to make it so that Boreas somewhat mimics the other Elemental Lords (ie remove his awesome Summon skills).
I could add the 0-AP summon ability to the respective Elemental lords (ie Sua the Fire Lord getting the 0-AP Fire elemental summon) and add a few choice skills to their existing skillset.