The Mermaid Outfit is one of the many costumes in the game that you can find out in the open world in Hello Kitty Island ...

In Hello Kitty Island Adventure, you can find the Gemstone Critter List inside the Reef Critter Room in the Nature Preserve.

Mojang is giving away the Hello Kitty Lantern headwear in Minecraft for free as part of the ongoing Lunar Year celebrations.