OMKT, I totally screwed myself because when I picked up CoB that very first time, I cheated and looked at the end, so I already knew Jace and Clary were bro/sis. (That might be why it laid on my bedroom floor for three and a half months before I actually read it.)
But...first impressions. I LOVED BLUE HAIRED DUDE. >.< I was rolling on the floor and dying. And Jace... What to say about Jace? Okay, at first I was all 'blah. blonde perfect godlike hero.' I actually still thought that all the way into like chapter seven.
Alec. I too thought he had the hots for Clary. I also thought that he and Jace would have to fight each other for her. Then I moved on to slash shipping JacexAlec. Little did I know. But to my credit, I figured out he was gay pretty quickly.

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SUPPORT TOM KAULITZ!!!!!!!!!!!!!

Jem shook his head. You bit a vampire, he said. I saw you. You bit a vampire.
I had no choice, said Will. He was choking me.
I know, Jem said. But really, Will again?