The Last Olympian

I thought this was a wonderful concluding book to Percy's story. In ended in a way that closed his story but left enough string to open up more. This book did not end how I thought it was going to end, and that surprised me but I am nowhere mad at how Riordan chose to do so. I actually loved the ending, and thought it was unique.
I enjoyed seeing much more of Nico in this book than the last one, and seeing Percy grow into a more mature person. At first I was slightly skeptical because it seemed that he just kept making the wrong decisions in the last couple books but I thought he really stepped up in this last one to become the hero that his world needed. I also was very happy that he and Annabeth finally worked it out, and got together. Percy's tendency to just let girls confess their feelings and then leave then hanging was getting under my skin, and although I knew he had a lot of his plate it seemed like he had at least one chance to say Yes or No. But towards the second half of the book I could see he was finally working his own feelings out, and I was happy he did so.
I did not see Rachel's ending coming, but I am interested to see where the author takes this.