Read this, I included it above.
Again, Toot gets big from influence in the world similar to the sidhe. Jim mentions Mab wasn't always as big as she is now. (I distinctly remember a smiley face here for some reason) Anyways, this is where people jump to the conclusion that Mab was a tiny fairie as Shakespeare once described. It's a faulty assumption. We now have WOJ- that says "Shakespeare didn't know what he was talking about." This was a general statement by Jim so not specific to any one thing but I think we can safely assume Shakespeare didn't accurately depict the nature of Faerie.
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Q: How big will Toot get?
A: Depends on how much influence he has in the world. That’s how the sidhe gain their size and power. Mab wasn’t always as big as she is now.
I have more to say regarding your reply. I'll add it here...
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The Queens seem to be seperate from the rest of the Fae. Even the Erlking seems more closely related to other Fae than the Queens
There is one WOJ that pertains to this. Let me get it. It has humans being the origin of most of the Fae.
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WOJ: Ok, do they automatically become Fae, do they lose their soul? The answer to that question is “sort of”. Um, it’s automatic, but not necessarily instant. Mab herself was human once, and she eventually became the, uh, the fun-loving Mab that we all know. So, a lot of it has to do with who you are when you go into it, because most of the Fae were human once. A lot were born as half-bloods and decided to become Fae and sort of automatically got their mantle for free, but all the other fae who were there, including the Erl and several others, who were at one point humans….So, a lot of this is going to depend on who they might end up being, a lot of it depends on who they are going into it and what kind of will they have to maintain who they are. That’s going to be a big deal. I’m really looking forward to writing the next books so I can see what happens with Molly, ‘cause I’m really not sure yet, I have a vague idea of what’s gonna happen, because basically she just got handed the largest, unruliest crowd of little brothers and sisters to deal with ever.