1: No big soldiers. 2: Emerald already has a use planned. 3: No big soldiers. 4: Pay more attention. 5: No big soldiers. Now, if I STILL haven't been clear enough about the subject, you need to find a kindergarten teacher to teach you how to read.
The pets you're describing sound about like our already planned companion system. We're not making a new dimension for this mod, nor are we going to make one based around the soldiers. Lastly, the soldiers are just that, soldiers. Making them able to trade is rather pointless. And making them spawn naturally is unfitting to the purpose.