Yea my first thought was that there's Red Mage. While it might not hit your personal funnybone you kinda have to deal with the hand you're dealt.
Jobs in XIV really need to have a distictive difference between each role to make it reasonable to pick one over the other.

While all DPS in general; "just deal damage" and Square has limited job abilities to a point where all jobs kind of feel the same, there is still a marging of uniqueness with each job.

I'm not entirely sure at what point you are in the game, but Endwalker, more specifically current patch content has a tease of what the next job MIGHT be.
It's heavily based on what we have seen in previous FF games as well.

That said, your way of descibing the Job reminds me a bit of an Insect Glaive user from Monster Hunter. In that game the user of the twinblade, or glaive uses a bug which flies and tranfers essence from enemies to the player.
So maybe the magic component could be some sort of a small minion on the left hand while the right hand holds the twinblade. But that would be too similar to Monster Hunter I guess.