This looks dope. What version of Storyteller is this? 1e or Chronicles. Looks like 1e.
I am afraid I do not have a bestiary or antagonist book, that is still in progress at this time.
In the demon rules, however, there are some rules I started for generating Seraphim and Sorcerers which are the primary antagonists to the Demons. You can use the base mortal World of Darkness rules to make those as antagonists.