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The only reason we consider Symphogear mecha is that Hibiki is considered to have 熱血, it's actually a magical girl show. That goes the same for Yuki Yuna and Nanoha. But while we're talking about Nanoha: the only thing mechamusume in it is Subaru and Ginga are cyborgs while the Grimore agents are digital constructs. 

But are digital constructs mecha?  Is Cortana or Shodan mecha?