What are all the characters names in book sweet venom?

It seems you're asking about the characters from the book "Sweet Venom" by Jennifer L. Armentrout. However, there isn't a book by this name.

Are you perhaps thinking of one of these books?

* "Sweet Venom" by Erin Watt, part of the Royals series.

* "Sweet Venom" by M.K. Estep, part of the "Black Dagger Brotherhood" series.

If you provide the author's name or a little more detail about the book, I can help you find the characters' names.