Bartimaeus is my favorite character from any fiction at the moment. He's just... awesome. I highly recommend reading the first chapter of "The Amulet of Samarkand" to get a small taste of the genius of that character (and I mean a small taste, need to get part way through the book to fully understand his greatness).
“Anna, my strong, terrifying Anna.” -Cas
"You lack the requisite spine and testicular fortitude to study under me" -Elodin