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).
"You lack the requisite spine and testicular fortitude to study under me"
“You do not know the first note of the music that moves me.”