Gilgaros strongly resembles his Boss Yo-kai counterpart Ogralus in that he is an imposing figure with clawed limbs, a fang-filled smile, two horns jutting from his head, and a red ponytail. He carries a huge spiked club. Unlike Ogralus, however, Gilgaros is a yellow-gold color and wears a purple scarf with some black splotches that matches his loincloth.
As a Yo-kai imprisoned behind the eight seals of the other Crank-a-kai exclusive Yokai, it can be said that Gilgaros is the most terrifying Yo-kai of all. However, upon his release, he is friendly enough to give his medal to the player, something no other Oni of his calibur would do until the second game, indicating he is at least thankful to have been released.
Nate, Jibanyan, Whisper and Tomnyan meet Gilgaros in EP155.
He appeared in Terror Time with the other Oni's and Nate, Tomnyan, Jibanyan and Whisper during Setsubun.
After playing a game of baseball with his Oni brethren, where he was the only one to get a home run, he then gave Nate his medal.
He is the most powerful Yo-kai which can be befriended in Yo-kai Watch.
Even though the Yo-kai Medallium describes him as the most powerful oni, Gargaros, Ogralus, and Orcanos have higher stats than he does , although he is arguably better in being competitive than Ogralus.
Gilgaros' elemental attribute is reminiscent of the thunder god Raijin.
Gilgaros is the only large Oni that can be befriended in Yo-kai Watch.
"Gilgaros" is a combination of gilded and Gargaros.