So what exactly are Sakuya's controls right now? It looks like Phantom Break (bounce off floor) is B, Phantom Break (bounce off sky) is Down-B, Lightning Storm is a down throw, Snow Storm is Phantom Break used in midair, and Hail Storm is Side-B?
I've got two major concerns right now: First, Sakuya's attacks don't have a lot of visual variety. Second, it's fine in 1-on-1 tournament situations, but when you've got 4 players and maybe exploding items on the screen, the sheer number of projectiles could cause a lot of collateral damage and confusion (particularly if the knives have room to ricochet, and/or you have multiple Sakuyas and can't always keep track of whose knives are whose).
This could be improved just by making the knives (or their auras) different colours for each attack, but what I'd really like to see is different numbers of knives - e.g. a single large red knife for one special (shieldbreaking?), a spread of three slow/ricocheting yellow knives for another, and a larger number of parallel blue knives for a third. This could let you give each attack a role that IMO would be intuitive even to the most casual of gamers who's randomly handed a controller and starts pushing buttons to see what they do - attack 1 is strong but hard to hit with, attack 2 fills a wide area and makes it hard for enemies to pass through, and attack 3 is a reliable way to get in lots of hits. It could be reinforced by playing the knife-throwing SFX at a lower pitch for attack 1, to make it sound "heavy".
Concentrating more or less power into each individual knife also lets you give them a greater range of priorities (assuming you're using SSB mechanics for that).
