Riku (Halloween Town)

Riku's Halloween Form is a form of Riku exclusive to Kingdom Hearts Re:Chain of Memories. While it doesn't change Riku's appearance as drastically as Sora, Donald, or Goofy's forms in Halloween Town, it does slightly darken his features. Riku only takes on this form when in the card world Halloween Town.

Kingdom Hearts Re:Chain of Memories
A boy who was born and raised on a small group of islands.

Riku dreamt of seeing other worlds, and so he forsook the islands--only to be seduced by the power of darkness.

Enslaved by Ansem, pursuer of darkness, Riku clashed with his childhood friend Sora.

But in the end, he was able to regain himself, and together with Sora closed the door to darkness.

Still, the dark wounds in Riku's heart have yet to mend.

Appearance
While in Halloween Town, Riku's hair, outfit and complexion are darkened. Texture lines on Riku's body are more exaggerated, and his facial expression becomes more grim, as seen in the D-Report image. These physical changes also appear when Riku is in Dark Mode. Along with changes to his body and outfit, the Soul Eater Riku wields is darkened as well.

Trivia

 * Riku's Halloween Form is a Kingdom Hearts Re:Chain of Memories exclusive. His form does not change appearance when exploring Halloween Town in the original Kingdom Hearts: Chain of Memories.