Avatar the Last Airbender is anti-fascist and also a great show all around.
However, I nominate Samurai Jack for best politics. Jack unites exploited peoples across the realm and even leads violent slave rebellions.
Bonus terrible answer: Pokemon, which is a capitalist hellscape fixated on slave-animal bloodsports.
I was bawling at the end of episode 4 when the veteran was talking to his friend’s ghost, and then when they brought the martyrs home, and now someone’s cutting onions again
replying to, but comrades: please share if you find english sub on this series. I only know youtube thank you