Since I don't know the author of 'After Todd', it's difficult to list their other books. However, you could check at your local library. Librarians are often very helpful in finding works by a particular author. They can use library catalog systems which are designed to track all the books written by different authors.
Yes, they are quite popular. His works have attracted a significant number of fans within the genre. Many people who love fantasy are drawn to his books because of the unique elements he brings to the table.
You can try large online book retailers like Amazon. They usually have a vast collection of books, and you might be able to find Todd science fiction books there.
Yes, there might be new indie authors who write in a similar style. You can search for books with similar themes on platforms like Goodreads. For instance, if Todd and Anna's novels are about self - discovery, you may find new books with the same focus.
Perhaps Todd is a normal villager who has always been fascinated by Naruto. One day, he discovers that he has some latent ability that is related to the Kyuubi's power. Naruto, as a sennin, takes notice of Todd and decides to train him. So, Todd could be an underdog character who is thrust into the world of ninjas and the Kyuubi's mystery.
As I don't know the identity of the author of 'After Todd', it's not feasible to give you the names of their other books. Another option is to search for book reviews of 'After Todd'. Sometimes, reviewers mention other works by the same author in their reviews, which could give you a clue about what else the author has written.