 If you liked Casshern Sins |  ...then you might like Shingeki no Kyojin: The Final Season |
Attack on titan season 4's biggest characteristic is Eren yeager. His extreme complexity is what drives the entire season. Casshern Sins has inspired a huge part of Eren's character to the point that They are pretty much the same characters thematically. Scene by scene, line by line, AOT has been heavily influenced by Casshern sins. It borrows the most things from it. Casshern and Eren are 2 of the most complex characters ever and even though Eren still wins in pure complexity, Casshern is able to achieve relatively much more in a significantly shorter run. Other similarities- 1)Extremely depressing tones (CS>>AOT) 2)Great OST (AOT>>CS) 3)Heavily philosophical and tackling similar themes
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