Pet Dragon/Drake and Pet Units

Hi All,

I have a few questions on modding.

I just created a set of Sovereigns and some heroes.  I want one of them to have a pet Dragon.  The others, I wanted to start off with a special hero bodyguard I designed.  How do I designate that?  Do I need to add something to my Sovereign xml file?

Another question is how do I make my custom random npcs show up in my game.  Where do I add them in the C:\My Documents\My Games\Elemental folder?  Do I have to name them in a specific way? 

I really don't want to edit any of the core files.  Would prefer to stick to using the modding folders.

Thanks