User blog comment:Keekian/The topic of Haki./@comment-24850639-20171229162127

Only ones I'd say I disagree on are Nami learning haki at all, and Usopp learning buso. Although Nami has gotten into a scuffle here and there, her primary fighting technique is the weather. I don't think haki would really add much to her repertoire. Her attacks take too long to develop for observation haki to really be of much use to her, and she can't really enhance things like lightning or wind with armament haki. Usopp is a sniper, and while he is a long range fighter somewhat similar to Nami, his primary fighting technique is firing projectiles. He is not a hand-to-hand combatant in the slightest, and I'm not quite seeing the application of armament haki to his pop greens. Most of the ones we've seen so far don't really have effects that buso haki can enhance, though there have been exceptions like the shuriken that he sliced Trebol with. Maybe make things like Impact Wolf more durable? More possible than Nami for sure, but I'm on the fence.

I initially felt the same way about Robin since Oda seldom lets her get her hands dirty (pun intended), but for the way she fights, its definitely makes sense. She's claimed on several occassions that speed means nothing to her in an opponent, so having some Observation haki to back that up now that we're in the big leagues makes sense. Buso haki makes since as well, now that she's sprouting giant limbs that support her in combat, and can even make clones of herself.

Haki is now becoming a necessity to be taken seriously at all, it's no longer something that can seperate you from the pack, unless it's Conqueror's. I'm more curious now what circumstances will cause them all to unlock it. Usopp learned it because he absolutely refused to allow Sugar to make him forget the person who's responsible for him being a pirate in the first place.