Darkubes

The Darkubes is an Emblem Heartless that appears in Kingdom Hearts III.

Kingdom Hearts III
The Darkubes are released on San Fransokyo by Dark Riku in an experiment to create a complete heart from data, using the first combat chip that Hiro Hamada created for Baymax. They are encountered by Sora, Donald, Goofy, and the members of Big Hero 6 after a day spent successfully fighting the Heartless attacking the city, and given their moniker by Fred. After an unsuccessful attempt at fighting the Darkubes, Sora, Donald, and Goofy work to free Wasabi, Go Go Tomago, Honey Lemon, and Fred, who have been incapacitated by the Darkubes.

During this time, Hiro determines that the Darkubes operate from a central core. When Sora, Donald, Goofy, and Big Hero 6 go to confront the Darkubes, they meet Dark Riku, who is observing the data stored on the combat chip. He then sets the Darkubes on Sora and his friends; although the Heartless is defeated, Dark Riku reclaims the combat chip and withdraws.

The Darkubes attack San Fransokyo again the next day. This time, however, Dark Riku destroys the Heartless before it can face Sora and his friends, having determined the combat chip to contain the necessary data. The Darkubes are then used to construct new combat armour for the original Baymax model, creating Dark Baymax.

Design
The central core Heartless of the Darkubes is a cubical Heartless that emits strange, cube-shaped steam bubbles. Its body is black, with Heartless-characteristic glowing yellow eyes. The Darkubes themselves are black cubes covered with patterns identical to those of the Blox.

The Darkubes are based on the Microbots created by Hiro Hamada in the 2014 Disney animated film Big Hero 6, and briefly mistaken for such by Hiro in Kingdom Hearts III.