Four novels signed to your choice of recipient in the Young Adult (or adult) urban fantasy Demon Underground series by Parker Blue:  Bite Me, Try Me, Fang Me, and Make Me.  The series stars Val Shapiro, part demon vampire hunter and her hellhound sidekick (and everyone's favorite character), Fang!

You also get the opportunity to name a character who will be killed by a vampire in the next book, Dare Me!