Hey, this seems interesting, and it might just be because I love stats and numbers. Now I have a couple questions if you'll bear with me;

What are personas? How do these work and / or manifest in a particular person? I'd just want a tiny bit of info at the very least as I am completely unknowledgable about this subject, which I assume is something already concrete.

I'll ask the same questions as above but replace personas withn "arcana".

And a final, is there any reason why the main characters must be teenagers? Just curious as it doesn't make such a big difference.

Thank you for you time! 

Edit: I might have spoke too soon, heheh.