AntiForm

Darkness corrodes Darkness coils. It lies in the Hearts of even the most virtuous of Heroes, waiting for a chance to sure forward like a serpent in the water.
Malign and voracious, the frigid touch of Darkness envelops the radiance of Light for just a passing moment. 

In her Heart's brief exposure to the saturated corrosion of the Dark Realm for but a passing moment, Suihei was irrevocably corrupted with a terrible blight. Too much reliance on the Distortion Drives passed down to her by three great fairies leads to such a malicious darkness flaring out in an attempt to expunge itself, leaving her feral, and in a form reminiscent of one of the more dangerous denizens of the Dark. Though incredibly powerful, it wrenches every ounce of self-control Suihei has over herself away from her, leaving her as a thoughtless beast that cares not for friend, nor foe.

It is only through the reconciliation and acceptance of her Darkness that she eventually comes to tap into an even greater power, purified by Light.

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Void Cutter ; Suihei executes a rolling lunge, pouncing onto an enemy before kicking them away with vaulting scratches that impact multiple times.

Dark Bomb ; Finisher. Suihei shoots orbs of dark energy which, after a few seconds, expand into damaging force-fields.

Shadow Split ; Finisher. Suihei leaps forward, emitting dark magic from her claws while weaving through enemies with a decisive blow. Weaker enemies are eliminated on the spot.

Shade Impact ;  Suihei spins at high speeds around the outskirts of the battlefield, using four of her after-images to charge at a target, before pouncing from above and into the center of the area, creating a damaging shockwave.

Side Spin;  Suihei emerges from the shadows and charges at a target, leaving a trail of dark flames in her wake.

AntiGlide ; Suihei melds into the shadows, gliding on air before darting towards an enemy.

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The AntiForm. Something that I should've actually gotten done ages ago, but had trouble deciding on how it would look. Though impossible to see, as this picture was put through a filter, her colors are more reminiscent of a Dark Hide instead of a traditional Shadow, such as Sora's. Despite their superficial similarities in behavior, it cannot be doubted that Suihei carries more contempt in her Heart than her predecessor. As her Light shines brightly, so too, does her Darkness ferment into a wretched, wretched thing. 

Eventually she does manage to break out of it one way or another, and that leads to her final form equivalent - which utilizes a blend of Light and Darkness. Neat, huh? 'w'

I also practiced my colours with this! ;w;

Art (c)
Suihei / Colors (c)