We begin with the Paranormal Fiction 2013 Reading Challenge, hosted by Reading with Martinis. This is a year-long challenge with no sign-up deadline and 4 levels. Reviewing does not seem to be required, but some kind of online tracking is.
There are only 4 participants so far, but I see an opportunity for someone who is doing the Reading Challenge Addict challenge to combine it with the next challenge - or even all of the following challenges - for extra points:
Paranormal Reading Challenge is hosted by Auntie Spinelli Reads and Megan Likes Books. This is a challenge to read books featuring several different paranormal creatures. It is a year-long challenge with sign-ups open until December 1. Posting reviews is a must, since every month there is a giveaway for those who have posted, and the more reviews you post, the more entries you have in the giveaway drawing. And at the end of the year there will be a grand prize drawing. There are 152 participants already, and you can find more rules and information at the sign-up page.
And now lets move on to more narrowly defined challenges.
There are 4 levels and you must commit to read between 1 and 20 books which, as the host puts it include "a witch as a main character or major witchcraft elements". 110 people have joined already.
Immortal Reading Challenge. This is hosted by Under the Covers and runs all year long with no sign-up deadline.
There are 4 categories, covering different kinds of immortal beings: vampires, angels/demons, fae/magic and shapeshifters. For any category you are expected to read at least three books and you decide how many categories you choose to participate in. More rules can be found in the sign-up post.
Zombie Challenge is hosted by Book Chick City and runs all year long with no sign-up deadline. The challenge is simple: read about zombies. There are 4 levels and depending on which one you choose, you pledge to read between 6 and 24 zombie books. Crossovers are allowed and reviewing is not expected but is encouraged, but you will be expected to keep track of what you read online. There are 39 participants already. More rules can be found in the sign-up post.