I think Soul wants the fantasy to be somewhat believable. The problem is: How does Taki make sense than Natsu? Both are exaggerated anime tropes for a man's fantasy. It sounds more like a preference of one fantasy over another argument than anything else. Pretty sure Taki would be stern with Soul if he talked smack about her disciple Natsu.
Jokes aside, I think my ideas for new weapons are kinda limited.
How about a simple long sword user? Not long or humongous like Siegfried and Nightmare. You can even make the design like Arthur of SC3, some fantasy lord of the rings design made soul calibur, knights, etc.
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I saw Ezio use a crossbow, but why incorporate some sort of bow in the game. Bladed Bow like Ina from Samurai warriors could be a good example.
Just some ideas playing another game.