 If you liked
Kidou Senshi Gundam
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 ...then you might like
Mazinger Z
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Mazinger Z and Mobile Suit Gundam are both one of the oldest and greatest Mecha/Super Robot anime's there is, both of these classics involve teens dragged into piloting a giant robot to fight other giant robots. Both Amuro and Kouji are apart of the Super Robot pilots "holy trinity" (which was started by Super Robot Taisen).
If you're into mecha and you want to dvelve into the history of the genre, you definitely shouldn't miss these two series who both played huge part in setting the tropes of the genre. Mazinger Z being the first piloted mecha while Gundam being the fist mecha aiming for more realistic portrayal of the technology.
Revolutionary frontrunners in anime, popularizing the mecha genre. Both a generally aimed toward a younger demographic but end up developing into very genuine stories of humanity and ever-present war throughout their runtime. Mazinger Z and Gundam also both developed into long-lasting franchises with a myriad of sequels and spinoffs.