Fantasy book series like Harry Potter, Chronicles of Narnia, The Dark is Rising, His Dark Materials, etc. often come up on this forum. These are quintessentially British series that many of us enjoy re-reading even as adults. They usually feature a group of children bridging our everyday world and a fantasy universe.
Are there any such popular / classic series in other languages, for example a French series that is a blend of a quintessentially French children's story and adventures in a fantasy world? Obviously if there were any modern bestselling global phenomena like Harry Potter in other languages, I'm sure I would have heard about it by now. But just as a people outside the Anglosphere might not be familiar with older fantasy series like Narnia or The Dark is Rising, what foreign language classic fantasy series might we be missing out on? The only (relatively modern) one I can think of is The Witcher (Polish), but based on watching the TV show it's not family-friendly like the ones above.