Rikuto
P-P-P-P-P-P-POWER!
I use .
I do not know if this is true, but I personally don't use because I thought it takes a couple frames to go from "Backstepping" to "Blocking". Getting caught in a backstep awards counter blow damage to the attacker. So it's not a risk I prefer to take. However I have not verified if that transition occurs or not.
21[4] or 87[4] removes that issue entirely. Sidewalk cancel for the win.