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Yo-kai Medallium biography
"In the Egg Kingdom, it's said that once every thousand years a girl carrying a "golden yolk" in her hands is born. As she grows into a beautiful young woman, she becomes the princess of that kingdom. Her name is... Tamago no Kimi."
A humanoid Yo-kai with pale skin, Tamago no Kimi has long white hair with the bottom part being chiffon white, golden-yellow eyes with red eyeshadow, and small thick eyebrows. She wears a red ribbon neckcollar, a salmon pink kimono held by a red obi with a pale indigo rope, and a red crown. She rests on a cracked eggshell, and several fragments of said eggshell can be found floating around her head. Tamago no Kimi is seen holding a small egg yolk with a face.
Yo-kai Watch 3
In Yo-kai Watch: Wibble Wobble, clear stage 16 and befriend Sergeant Burly to unlock an extra mission that will award the player a download code. Submitting the code at the Post Office in Yo-kai Watch 3: Sukiyaki will give them a Wobble Egg, which makes Tamago no Kimi appear in the Sukiyaki restaurant, where she can be challenged once per day.
If the player put the code in Yo-kai Watch 3: Tempura or Yo-kai Watch 3: Sushi, they will receive Crank-a-kai Coins instead.