 If you liked
Getter Robo
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 ...then you might like
Mazinger Z
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These 2 manga are the founders of the mecha genre, and they heavily influenced almost all super robot manga/anime that came afterwards (including Neon Genesis Evangelion, G Gundam, and Tengen Toppa Gurren Lagann). They have a very similar-looking art style and overall feeling. They're both relatively light-hearted, but they have plenty of GAR, manliness, and hot-blooded mecha pilots. If you want to see what early mecha manga/anime was like, go read either one of these manga.
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Recommended by zenketsuzenryoku
The classic art style is the most obvious similarity, but the tone is very alike too. Both set precedents in the mecha genre that are still followed today. Neither are very long reads either.
These manga (and their respective series) are sort of eternally connected, even discounting the Dynamic Pro/Go Nagai connection. Pretty much necessary reading for any serious mecha fan.
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Recommended by PlasticRobot