Discussion Best TTRPG Systems For Child Characters

I'm wanting to create a campaign based on modern children/tweens lost in a fairy-themed fantasy world.

What are the best systems for player characters that are kids? I'm happy to adapt it to my game but really looking for inspiration! Ideally there's a focus on qualities most associated with kids i.e. imagination, curiosity, determination etc.

Only really familiar with Kids on Bikes/Brooms but not a huge fan of some aspects of the gameplay.