I think a ton of people can do Haki blasts, like Hyogoro. It's just a different type of CoA. This doesn't mean that their hardening (koka) is super strong. That's a different category. It's just they can make Haki flow.
From pre-TS I think Sentomaru, CP9 and Boa's sisters can all do it. Out of Shichibukai, at least half of them can do it. I think Mihawk, Doffy, Hancock can do it, maybe even Kuma and Jinbe. Out of the commanders Burgess can do it and so can Sabo.
I think how Doffy broke out of Aokiji's ice is by blasting Haki. There is 0 other explanation. He showed this when he cut Dressrosa castle by air pressure (people wrongly attribute it to strings. There were no strings there. Just pure air pressure), just like Cp0:
And if Boa's sister has it, so does Hancock
And I wouldn't be surprised if Jinbe can somehow transfer Haki through his fishman Karate
Even Burgess seems to be imbuing Haki in his shots
All Haki blasts are are imbuing Haki in a projectile manner. Zoro can probably already do this.
![](https://vignette.wikia.nocookie.net/onepiece/images/d/d7/Hyogoro_Attacks_Alpacaman.png/revision/latest?cb=20190426071738)
From pre-TS I think Sentomaru, CP9 and Boa's sisters can all do it. Out of Shichibukai, at least half of them can do it. I think Mihawk, Doffy, Hancock can do it, maybe even Kuma and Jinbe. Out of the commanders Burgess can do it and so can Sabo.
![](https://thumbs.gfycat.com/InfamousMajesticFalcon-size_restricted.gif)
I think how Doffy broke out of Aokiji's ice is by blasting Haki. There is 0 other explanation. He showed this when he cut Dressrosa castle by air pressure (people wrongly attribute it to strings. There were no strings there. Just pure air pressure), just like Cp0:
![](https://thumbs.gfycat.com/QuerulousThoroughAnkolewatusi-size_restricted.gif)
And if Boa's sister has it, so does Hancock
![](https://www.opgt.it/wp-content/uploads/2019/04/STAMP.png)
And I wouldn't be surprised if Jinbe can somehow transfer Haki through his fishman Karate
![](https://vignette.wikia.nocookie.net/onepiece/images/e/e8/Samegawara_Seiken.png/revision/latest/scale-to-width-down/340?cb=20150527173438&path-prefix=id)
Even Burgess seems to be imbuing Haki in his shots
![](https://i.imgur.com/nq8gHQq.png)
All Haki blasts are are imbuing Haki in a projectile manner. Zoro can probably already do this.