I'm not sure whether this has been discussed before or is even partially implemented, but with the "recent" addition of pets, I suddenly had what I believed to be a funny thought:
What if the world bosses had pets in their loot tables? These would be somewhat better than your common pets, but still not game-breakingly good. because I for one would -love- to have a mini-Reklar following me, or a mini-SoG.
And this wouldn't have to only apply to world bosses, some special named creatures could have the possibility as well.
As for drop rate, well it shouldn't be too easy for the ones from the mobs that are quite low (The named Treant near ED for example, he's relatively strong, but still farmable), but with the world bosses it shouldn't be all too hard to get them (ie. 1 to 3 hunts should yield atleast 1 pet)