These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Game Breaker: In the remake, the Chi Attack is this during the latter part of a boss fight. As long as you're not wasting it on mooks (who, given the relative simplicity of the game, you shouldn't need it for) it gives the player a free block from any attack or group of attacks as well as a longer combo string.