Books for a non-native english speakers ?

Hello ..
I'm a non-native english speaker and I'm planning to start read english books , I've already read " Wonder " by R.J. Palacio , and the language was really easy and understandable .
I'm also planning to read Harry Potter series because I've watched the movies and I really like them , and it would be great to look closer at the characters personalities .
So what would you recommend for me ? I would like something with a plot and realistic characters , and it would be amazing if it is an anti-hero book . but I wont ask for much lol .
Thanks a lot .