The Wight Knight bears a strong resemblance to the mummy character from The Nightmare Before Christmas. Its grayish-blue skinned, almost skeletal figure is wrapped in patches of white gauze bandages; the head is completely covered in them, save for a gap that reveals a bright yellow eye in a shadowed face, and the Knight's "plume", a simple angular-spiraled antenna. Wight Knights also have a "ribcage" of six sharp barbs that surround their chest and Heartless emblem, large hands, and long barbed fingers and toes.
In Kingdom Hearts Final Mix, Wight Knights have simple, straightforward recolors; gold replaces the white of the bandages, black is the new skin color, and the hands, fingers, and toes are re-tinted a reddish-brown.
The word "wight" has several meanings: as a noun, it can mean a ghost or a supernatural entity, referencing the Heartless's undead appearance. As an adjective, it can mean brave, valorous or strong, referencing the Heartless's quick, powerful attacks. The term altogether is a play on "white knight", which is ironic considering its decrepit appearance.
Wight Knights are fast and fairly strong, making it difficult to hit. In Kingdom Hearts, a carefully timed Guard will block a Wight Knight's attack, leaving it stunned and open for attacks. In Kingdom Hearts Chain of Memories, keep a distance from it and break its attack when possible, then make quick work of it. In Kingdom Hearts II, Guard will work, but Reflect is recommended.
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