Well, in the latest chapter, we see Marigold, one of the Gorgon sisters, use Haki to control fire. Also, it's commented that Sandersonia's Orochi technique transforms her hair into snakes with "fangs of steel". Judging from this, it looks like Haki users can be quite creative with how they manipulate their Haki, infusing it into various objects and substances. It'll be quite interesting to see the various ways Haki will be used in future storylines....
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