Your abilities SW.

"The blade is wrapped in shadows that take the shape of flames, allowing the blade to be instantaneously summoned from any shadow whatsoever."

I know Kurisa said something about this, something like it'd have to be a specific shadow considering shadows are everywhere. Post duration and cooldowns are needed too.

"Increased Strength (5 post use, Ten post cool down)"

I guess that's fine how it is.

"Through ability #1, Kaien can charge his Reiatsu into the flame-shadows and increase the striking power of his Zanpakutō . (7 post use, 7 post cool down)"

..... I think the post duration could be shortened as he already has an ability that increases strength, so I don't think a seven post use is necessary for this one. Plus I don't see the point of the flames, so?

"Increased Speed(2 post use, 3 post cooldown.)"

Guess that's ok.