If someone wantesld to be able to use haki in your game, how would someone here rule it?
First, you have to determine what it does and then you just assign powers. I don't know anything about it so I had to look it up.
Kenbunshoku Haki sounds like an array of supernatural senses that let you see auras. It could also be emulated by taking a re-skinned version of Wizard's Sight and Soulgaze.
Busoshoku sounds like toughness....it's says'allows the user to use their spirit as armor to defend against attacks or make their own attacks more potent."
I might say that this is done by taking toughness powers with a Catch of "X number of hits" because it says that this type is finite and runs out.
It increases attacks too, so maybe claws or Strength powers but it is finite, so I'm not sure how to make it run out. Limitation, probably.
It could also be done with spirit spellcasting. Using spell blocks and reskinned enchanted items to protect you and using evocation to attack. The stress taken from spellcasting would work well for making it finite.
Haoshoku seems to be mental manipulation and could be done with mental spirit spellcasting or incite emotion/incite effect or domination.
If Haki does anything else I'm missing, you'd just take the appropriate power. Spellcasting seems to cover a lot of what it can do.