Sure was. The iZombie comic provided the basis for the TV adaptation. The comic had its own unique storylines and characters that were carried over in some form to the screen.
I don't know what 'aLL leaves the horse' means.
While waiting for the anime, you can also click on the link below to read the classic original work of " Full-time Expert "!
Definitely. iZombie originated as a comic book that later got adapted into other forms of media. The comic provided the foundation for the characters and storylines we see today.