While at this point we have an understanding of the concept of a “weak” protagonists in giant robot anime thanks to characters like Ikari Shinji from Evangelion, rarely are main robots allowed to exude an image of weakness and vulnerability as well. If we even look at Shinji himself, while he’s known for being passive and lacking in will, the actual EVA-01 looks monstrous and acts even more terrifyingly.
In most cases when there is a “weak mecha,” it ends up being a joke character’s ride, whether that’s Boss Borot from Mazinger Z or Kerot from Combattler V. In terms of actual main-focus giant robots, the closest this concept gets its maybe Dai-Guard the almost-literal “budget robot,” or perhaps the perpetually incomplete Guntsuku-1 from Robotics;Notes. Maybe the Scope Dog from VOTOMS counts because it’s so disposable, but like Dai-Guard it still at least looks strong.
Of course it only makes sense that mecha tend to be on the powerful side; they’re giant mechanical humanoids after all. It’s just something I’m starting to consider a potential limitation of the genre and an interesting space to explore.