Blue
Ravenous Bugblatter Beast of Traal
I was discussing the monk with a player in my group. We both agreed that the monk gets too few ki points and is one of the weaker classes for that reason. Monks get 1 ki per level, so at third level the monk has 3 ki points. With 3 ki points at that level, the monk can do a couple of things in a fight and then is left with nothing but a simple melee attack until the next short rest. At 10th level, with only 10 ki points, again the monk can't last long before he burns through all those ki points, and is left fairly weak from then. Weaker than a 10th level should be in my opinion.
Now, I don't think the monk is badly unbalanced; just a bit unbalanced. And I think that a slight nudge would make a big difference. My feeling is that increasing a monk's ki points by 50%, round up, would be in that "just right" zone. So at third level, the monk would have 5 ki points instead of 3. Not a big increase, but more reasonable to my mind. And by 10th level, the monk would have 15 ki points. Again, more reasonable.
Thoughts?
I see the problem from a different angle.
There are some things, like Stunning Strike, that cost only 1 ki that are amazing. If that was the standard calibration the monk absolutely does not need more ki. They are on-par or bettter than other weapon-wielder casters like Paladin or Ranger in terms of triggering special abilities. None of that type of class is balanced around being able to do their combat adds all day.
Looking at some of the abilities (especially the Way of the Four Elements subclass), the cots are much higher for so much less. If this was the standard calibration (so Stunning Strike would be about 4 Ki), then Monks have too little Ki and should have more.
In other words, the Ki costs between the utility of abilities is way off. Increasing Ki without raising the low ones would be unbalanced. Leaving Ki as it is leaves some abilities too expensive for what they return, causing you to miss out on using them so it's unbalanced in that you can't take advantage of your features.
To sum up - I'd either keep things as they are and reduce some of the very high Ki costs, or I'd give more Ki but also increase some of the cheap costs. Just adding Ki I feel would be unbalanced against the other weapon half-casters as well as the BM fighter that's also a short-rest-add-to-weapon class.