Oda should approve OVAs or specials on other characters tbh. I know that's not a popular trend in Japan but a Buggy movie involving a slightly larger side cast could be dope.
Or a Smoker movie.
Or a Smoker movie.

I just had the idea for an antagonist
"The Hellhound" is a broker from the underworld and a treasure hunter. He’s Akainu's son and a good friend and rival of Doflamingo. He’s after Captain Johns treasure just like Buggy