Well, some of my favorites are-
- The School For Good and Evil
- Percy Jackson and The Olympians
- Waterfire Saga
- Harry Potter
- Shadow House
All of these are fantasy except for the Shadow House series, that would more fit into horror. And Harry Potter and Percy Jackson you have probably already heard of, The School For Good and Evil too, but the Waterfire Saga is a mermaid series, a bit dramaic to say the least though.