Yes, they are. Both Huckleberry Finn and Tom Sawyer are characters in Mark Twain's 'The Adventures of Tom Sawyer' and its sequel 'Adventures of Huckleberry Finn'.
Yes, Huckleberry Finn is often considered a picaresque novel. It follows the adventures of the protagonist, Huck, as he travels and encounters various characters and situations.
It's a浜夎 topic. While the novel contains elements that could be seen as racist by modern standards, it also provides a critical look at society at that time. So, it's not a straightforward yes or no.