User blog comment:The Koromo/Chapter 758 Review: Again/@comment-4493594-20140828204202/@comment-115.64.201.147-20140829160759

With the increasing numbers of Logias, developing Haki seems to be getting more common. Afterall, the new world is full of people who can use Haki. If according to drill head, the new world has tons of people who can use haoshoku, which is supposed to be the rarest, it seems like a set up the other two forms of haki will become much more common place. I mean, if you consider the fact that every marine of vice admiral and above can use Haki, that itself makes it feel fairly common.

Like you said, monster trio definitely need haki since they're the main fighters, and they physical close range fighters. I do agree that Robin and Brook would be the only ones due for a haki upgrade potetially. I would like to see Robin learning both forms of haki actually, but definitely at a much weaker level. Busoshoku will be very useful to her since that'll basically allow her to hold on and restrain Logia users. But I wouldn't want her to gain super power kind of busoshoku where her giant arms are gonna go around and become OP smashing tools. Maybe just enough that allows her to hold the 'real body'.

For Brook, I think it might be possible that they link something about his spirit to kenbunshoku. Kenbunshoku definitely fits Brook since he's ya know... Ghostly and stuff. And his fighting style focuses on speed. If he does get Buso as well, that'll be more of just a cutting power level up so that he gets to cut more stuff I guess...

Franky needs no haki. He needs some sea stone upgrades. Sea stones are getting as common as Haki is, so I don't see why he shouldn't start throwing in some good ole seastone onto himself.

Chopper I kinda would prefer him not to get any Haki, and if he does, probably just a punching powerup as well I guess... Nami definitely needs no haki.