Most of the typical weapons are already in the game. I don't know what other jobs can be added, but some of the weapons they can add could be:
-Whips. I am not sure what class can do this. Maybe Beast master, but that would sound like a limited class, since Yoshida said that pet classes are a pain in the ass and don't want more. Maybe a Exorcist/Demon Hunter class, something inspired in Castlevania Belmont clan.
-Puppets and/or Dolls: Puppet master as class or something similar that uses puppets or dolls to attack. Can be done without need to be a pet class. Just similar to summoner you can rotate your dolls and that. But maybe, would be too similar to summoner this way.
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Whatever weapon she is using, like a half moon blade. However she is a Witch, so, a melee caster or semi-melee like Red mage, who knows.