One of the main themes is the battle between good and evil. The angel Aziraphale and the demon Crowley, despite being on opposite sides, often find themselves working together. Another theme is friendship. Their relationship defies the norms of their respective celestial and infernal worlds. Also, there's a theme of fate versus free will as they try to stop the apocalypse and in doing so, question whether it's really their destiny to be on opposite sides.
You might enjoy 'Witches Abroad' as it has a mix of magic, adventure, and witty characters like in Good Omens. The storylines have a comparable charm and wit.
Yes, it was a successful novel. The characters in 'Good Omens' are well - developed and memorable. The story's ability to balance the serious topic of the end of the world with comical situations and witty dialogue made it a hit. Moreover, its popularity led to adaptations in other media, which is a clear sign of its success as a novel.
Sure, there is a Good Omens graphic novel. It brings the story to life in a visually appealing way. The illustrations enhance the experience of the narrative.
Good Omens is primarily a traditional novel. However, there might be some related adaptations or spin-offs in other forms, but the original work is not a graphic novel. It's known for its rich and imaginative storytelling in prose.