I have an idea, but it'll mean Aiden doesn't get his Caster until later in the RP. When I mean later, I don't mean like half-way through the RP, I mean like a few more IC days. I won't go into detail over VM, seeing as how it will spoil a lot, but if you want me to explain I can do it through PM. Either that, or you can just take my word :/
The obvious answer would be that Aiden somehow meets a Lucid, but that would be sort of 'cheapening' them, if you get what I mean.
Awesome... will make Luci more interesting to RP... I posted
Went with the idea that Aiden and Luci really have no idea who they are and that they have no idea there are others like them. Aiden is just drawn to destroying demons like some sort of instinct that he doesn't question (of coarse that is not who he is fighting in the beginning).
So I have been thinking, about how you asked if your familiar could talk? Seeing as how Rosa was able to talk, I think 'human' familiars could be given speech to make it less awkward than having them grumble and moan lol. So yeah, Luci can talk :p