curious question, animes were there are mechs with names, but they have human pilots would you consider them separate characters
My first reaction is no, I wouldn't unless the mecha itself had some level of sentience. Then again Deathscythe would likely get more votes than Duo, so...I don't know.
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"Middle Child Hates Tomato Sauce And Loves Disco", for example, is not a trope, even if three examples of it could be found.