Don't worry. I have you covered.
Click here to go over to the horror blog for all of my "comic" horror posts. And bonus if you own my book because I have an entire chapter of comic horror annotations that would work perfectly.
I also have created this reading map for Abraham Lincoln Vampire Hunter which is also a great readalike, and the map includes many more suggestions.
You will impress your patrons with your book expertise by having these readalikes ready, whether or not they actually check them out.