Lets just disregard the possibility that swords may not be able to consume logias or paramecias, what Devil fruit do you think is best for a sword, Logia, Paramecia, Zoan, don’t matter 🤷‍♂️ Me personally, I think Black Beards Darkness fruit or Marcos Fruit. With the Yami-Yami-No-Mi you could pull in and stop other peoples DF abilities, with Marcos you could heal Ig 💀