I read this as part of the 2018 PopSugar Reading Challenge, a "book about a villain or antihero." It also works in Book Riot's Read Harder Challenge, a "comic written and illustrated by the same person" and "comic that isn't published by Marvel, DC, or Image." I found the character of Nimona wonderfully snarky, at times vulnerable, and quite often an ordinary teenager in spite of her incredible powers. The book makes readers look at seemingly stock characters such as Sir Golden Loin and his arch-nemesis, Ballister Blackheart and notice that the villain has more scruples than the hero does (remind anyone else of Dr. Horrible's story?). There are plenty of sword fights, explosions, mad science gadgets, fiendish plots, etc. to keep any action comics or superhero readers happy, but there are deeper issues explored for those who care to pay attention to them.
Out of curiosity I also checked out the full cast audio version of the book. The casting for Nimona and Blackheart was perfect. Don't stick with the audio version alone, because you wouldn't want to miss out on Stevenson's great illustrations, but do listen if you get the chance.