I believe author Jeremy Robinson is on KU. I seem to remember an entry on his personal website saying that he was going exclusively to KU. His books are kind of an Action/Adventure/SciFi/Horror mix. There are a lot of them. He seems to be moving into comics now, something that doesn't interest me personally, but he has lots of books that he's written over the years. I've only read two of his books I think, so I don't have massive experience with him, but what I've read isn't bad. It held my interest throughout the book.
Here's a list of his books:
https://bewareofmonsters.com/the-books/
His personal website is named "Beware of Monsters".