One of the popular ones is 'Mort'. It's a great introduction to the character of Death in the Discworld series. Mort becomes Death's apprentice and gets involved in all sorts of interesting and humorous situations that really showcase Pratchett's unique writing style.
In the 'Death' Discworld novels, a major theme is the value of life. Despite Death being ever - present, the stories highlight how precious and unique each life is. There are also themes related to the afterlife, or at least the different beliefs about it within the Discworld. The novels play with the idea of what might come after death, whether it's a traditional heaven or hell type of concept, or something more unique to the Discworld's cosmology.
In the early novels like 'Mort', Death is more of an otherworldly, somewhat stoic figure. He takes on Mort as an apprentice and we start to see a bit of his sense of humor peek through. As the series progresses, especially in 'Reaper Man', we see his character develop more human - like qualities. When he's forced to take a holiday, he experiences things like having a job and interacting with people in a more 'normal' way, which changes him.
There's Windle Poons. He is an elderly wizard who experiences an unusual form of undead existence. His character provides a different view on life, death, and the magic in the Discworld. Another important character is Albert, who works for Death. He has a long - standing relationship with Death and often provides some comical and practical advice within the stories.
Well, 'Night Watch' is a very significant Discworld novel. It takes the reader back in time in the city of Ankh - Morpork and shows how the city's Watch, the police force, came to be what it is in the present - day novels. Also, 'Reaper Man' is important as it deals with Death's sabbatical from his duties and the chaos that ensues. These novels are important as they expand on the lore and the complex web of relationships in the Discworld.
I think 'Mort' is also very popular. It has a unique story about Death taking on an apprentice, and the graphic novel version makes it even more accessible and engaging. The art style is really appealing to many fans of the series.
Definitely 'Wyrd Sisters'. It's a brilliant take on Shakespearean themes within the Discworld universe. The three witches are such memorable characters. The way Pratchett weaves the story, with all its political intrigue and magic, makes it one of the top Discworld novels. There are also many other great ones, but these are some of the most highly regarded.
One of the top Discworld novels is 'Going Postal'. Moist von Lipwig is a very interesting character. He's a con - man who is given the task of resurrecting the Ankh - Morpork postal service. The story is full of Pratchett's typical humor, clever wordplay, and interesting world - building. 'Equal Rites' is also a great one. It focuses on the first female wizard in the Discworld, Esk, and her journey in a male - dominated magical world, dealing with issues of gender and magic.