I recently tried to beat Archetype Earth in versus thinking (foolishly) that my greatly improved skills with my main character, Kohaku.
Boy was I wrong.
It turns out the only characters that I can match her with is Satsuki (where I consistently win one round and lose the rest), and... Archetype Earth.
Spoiler:
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I would like to add that you should tone down the Fighter's Cant, I'm still just a newbie.