If you liked
Kidou Butouden G Gundam
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...then you might like
Sengoku Basara
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They're the same show, except one has (more) gundams and stereotypes, while the other is limited to real people in Japan. Although, that Tadakatsu is suspiciously robotic...
If you liked
Giant Robo the Animation: Chikyuu ga Seishi Suru Hi
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...then you might like
Shin Mazinger Shougeki! Z-hen
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Both of them are insane "WHAT THE HELL IS GOING ON" for the first episode, and they have the same director.
If you liked
Devilman
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...then you might like
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Both Devilman and the Getter Robo series come straight from the twisted mind of Go Nagai. Most of the work done on Getter Robo is by Uncle Go's co-creator, the late Ken Ishikawa, however, their storytelling and general theme is very similar. In the recently-scanslated Shin Getter Robo manga, the Getter team goes through several... very "extreme" scenarios, including alien invasions and lack of control on their own power sources. Devilman also has invasions (demon invasions!) and a generally gritty depiction of life. Both have tons of blood and violence, following Uncle Go's traditional style.