I noticed that there are no bug zoan fruits in the series, which I believe is a shame 'cause there are sooo many different kinds of bugs with sooo many different traits. A few I thought up.
Spider: Imagine a spider-man like pirate shooting webs and web-slingling from ship to ship. That'd be awesome
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Scorpion: Covered in an armored shell with pincers and a tail filled with venom... or is it poison? I forget what the difference is. Point is, that's badass.
Centipede: You have multiple arms that can fight off a lot of people.
Japanese Hornet: I know that you all are wondering why I say "Japanese" hornet. That's because those bugs are some of the biggest and nastiest in the entire bug kingdom. Killer bees have got nothing on them.