Today's paranormal beings are the Imp and the Incubus. These two actually have something in common. They are both demons. The Imp is a small mischievous demon and is often blamed for daily mishaps. The Incubus is a male demon who seduces women while they sleep by infiltrating their dreams. So far I haven't read a book with either of these creatures in it, but I know I've heard of them before.
Alright, on to the "I" books:
If I Fail, A Jake Carrington Mystery by Marian Lanouette
Infernal Machines by Will Millar
Into You by Riley J. Ford
Island of Secrets by Tammie Clarke Gibbs
Ivory-The Forever Girl by Rebecca Hamilton
Iris-Moonstone by Kayla Curry (Not yet released)