Illuminoct is a golden version of Venoct. He sports a white figure with long, sandy-blonde hair that covers most of his face. A small amount is pulled into a ponytail held with a sky blue band, which matches his visible eye. He wears a pale blue outfit with a very light blue-white material around the waist held with a white band. The lower leg is covered by pale brown material to match his fingerless gloves, while the toed-sandals are gold. Around his neck is a wispy, pale yellow scarf with the tails resembling dragon heads.
Illuminoct is a very high-strung Yo-kai in the game. His last quote before fighting you is "SHINING~!"
Illuminoct can only be found at Bucklebreaker Station which can only be reached by taking the Golden Happy-Go-Lucky Hexpress, which shows up rarely in the train stations connected to the outside of Gera Gera Abyss Resort, where he can be battled once a day until he's befriended through normal means.
Illuminoct is befriended by defeating him in the sidequest "He Who Ascended to the Light" but the quest is exclusive to the Tempura Version of the game. In the English verison, it is only available if the player sided with the Tempura heroes.
Illuminoct can be seen as a counterpart to Darkyubi: one resprents life and the other dark; they are recolors of Venoct and Kyubi who are counterparts, and in Yo-kai Watch 3 are exclusive to alternate versions of the game.