Both authors satirise social behaviour and give characters names that express their personalities. However in Nel's opinion Rowling's humour is more based on caricature and the names she invents are more like those found in Charles Dickens's stories,[21]:13–15 and Amanda Cockrell noted that many of these express their owners' traits through allusions that run from ancient Roman mythology to eighteenth-century German literature.[50] Rowling, like the Narnia series' author C.S. Lewis, thinks there is no rigid distinction between stories for children and for adults. Nel also noted that, like many good writers for children, Rowling combines literary genres‍—‌fantasy, young-adult fiction, boarding school stories, Bildungsroman and many others.[21]:51–52