Mine is the wings of fire series, it is a “kids” novel (think like warrior cats age range)
But Tui T sutherland is so good at writing characters and introducing and describing worlds and characters that i reread it every so often. Like, she managed to write a book from the pov of a mind reader and it works.
Every book is from a different character’s pov and each character feels wholly unique.
The main issue with the series is that the plot is kinda average at best, the characters really carry the story.
Probably the early books of the Lewis Barnavelt novels, beginning with The House with a Clock in Its Walls
The 2018 film is a pretty decent introduction to the concept, the magic world in it has always stuck with me as a rather fun subtle kind, the characters are quite enjoyable to read about, but I can totally see why it’s not exactly hailed as one of the great classics, too