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It’s a cliche, but Avatar: The Last Airbender.

Momo

Porco rosso, even if just for the line "I'd rather be a pig than a fascist"

I think others have brought up the difficulty with anti fascism for kids conceptually, but I've got some ideas that I think lean in the right direction at least.

Dr. Seuss has some bangers. I'm specifically thinking of the Butter Battle Book (criticizes the death drive and arms race) and Yertle the Turtle (about how hierarchy is built on the suffering of others) but there's a bunch of his stuff that's pretty solid.

Obviously Ghibli movies are skeptical of militarism and authorities, I'd also add The Iron Giant, one of the only times Brad Bird used his libertarianism for good.

The Tiffany Aching series is a disc world series aimed at a younger audience that stars a bunch of anti monarchist little fellas, not explicitly anti fascist but Pratchett is a good and empathetic writer.

On a similar note, I'd say the Series Of Unfortunate Events books are, probably unintentionally, about how liberal institutions are not capable of dealing with someone willing to break rules and be violent. They're a bit libbed up sometimes, kinda individualist I think but they're well written and skeptical of authority and institutions.

Also nobody has mentioned music but my kid likes Pete Seeger and Willi Carlisle, a lot of old worker songs are earworms and kids like to dance and sing.

For little kids though, I think the rule of thumb is to get them quality media that has solidaristic themes and lessons about being a good neighbor and friend. You want to help them develop prosocial skills so that when they're old enough to understand the struggle they can understand why you are on the side you have chosen to be on.

Maybe something like the lorax might be good since it's for kids and has a great message.

Miss Rachel, Bluey

Ghibli

If you want a more kid-friendly comic Superman Smashes the Klan is a pretty good one

That is a strange request. It would be difficult to understand Fascism without looking at its violence.

The best that I can suggest is the Sid Meier’s Civilization series, or specifically Sid Meier’s Civilization V. The player can fight against fascist civilisations, and it is a sequel rated Everyone 10+, but in a typical match an enemy is unlikely to adopt fascist policies until late in the game.

One Piece is probably OK for a 6 year old, the violence is mostly cartoon violence until the later arcs and he won't get to those for a few years