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.
Diane Duayne’s Young Wizard series, at least the first three books. I have really good memory of books and so it’s difficult for me to read any book more than once but I’ve read them tens of times.
There’s always something new to discover. It’s honestly a really good and well-written series.