Yeouiju (or Yeo for short) is the ancient dragon spirit who guides and protects Kim Wu in Killer Instinct (2013) He is a minor character of the Killer Instinct lore who was first introduced in the third chapter of the Killer Instinct Novella, "Dragon's Choice".
Yeouiju is among the mightiest of astral spirits that once dwelled in the same Astral Plane where Gargos now holds dominion. Finding his refuge on Earth, he has acted as a guardian to Kim Wu's maternal Korean family for more than two thousand years. At first residing within Kim Wu's uncle, Philip Yong, Yeouiju was transferred to Kim at the moment of her uncle's death. Yeo soon after revealed himself to her in a vision, in which he took the guise of a modest and dignified Korean man with cat-like golden eyes, before appearing to her in his dragon form. Upon bonding with the fiery young martial artist, Yeouiju emblazoned a beautiful tattoo all the way down Kim Wu's right arm, marking her as the dragon's chosen one in the coming war with Gargos.
Yeouiju resembles a small, translucent Chinese dragon with two antlers, and no visible arms or legs. He is golden in color, and is bathed in an azure aura which alternates between a heavenly bright and a more subtle hue. Yeo can manifest as up to three different projections of himself, and visibly floats around Kim Wu when she has Dragon Charges available in combat. He himself acts as a powerful projectile when Kim uses her Dragon Cannon ability.
In the Killer Instinct Novella, Yeouiju's human appearance is described as "a lithe and muscular Korean man of indeterminate age, dressed in silk robes", who has "a long salt and pepper colored mustache and goatee" and "eyes like molten gold orbs with a cat's vertical pupils", and who is displaying "the dignified yet modest bearing of a Kung Fu master."