So everybody knows Hawking's and his devil fruit, the Wara Wara No Mi, it's a paramecia which let's him make straw and become straw, but it's not a Logia, alright maybe a special paramecia. But he also redirects damage with voodoo dolls, but he is into Voodoo so maybe magic is real. But he also makes wood hair cloth and nails, like alot of metal nails.
Ok so all of this is weird right? It's not just me, his fruit is just an outlier on every front, but it's a Paramecia. But after what we saw with Luffy and his fruit being a "Paramecia" but now being revealed to be a Mythical Zoan makes it make more sense.
You can see where I'm going at this point, none of you are dum-none of you are that dumb(Joke for those who don't see that). The Wara Wara No Mi is a Mythical Zoan, that is my theory. It allows for the many many weird properties which just don't fall in line with the classification and name as a Straw Paramecia, it explains his tie to mystisism in his powers, explains the weird properties of what he can create for example the Nail Breath and his flying doom Scarecrow with a wood batt with nails attached and it also has a cloth jacket and what appears to be hair.
His Hybrid form would be when he turns parts of himself to Straw, much like how Marco turns parts of himself selectively into a phoenix or covers them in blue fire. And his full form being the Straw Scarecrow Man form.