To Becky Mervina, "Cuby" is more than just a floating cube. "He" is a manifestation of her quirk PixelCraft, and so he's the source of all of her moves and transformations. One such form is known as Pixel Legion.

Becky can give this command Cuby to split up into a swarm of smaller cubes for multiple uses, be it tracking, guiding, defending, and attacking.

In terms of attack, Cuby's most used attack is Pixel Storm which, on command, Becky can send some or all of the Pixel Legion flying in any direction and at high speeds. And they hit hard.

If he takes too much damage and breaks, Pixel Legion ends up as his default until he recharges.

Occasionally, Becky can command the small cubes to converge into one giant cube and drop down on enemies, Spirit Bomb-style. This Ultimate Move would be known as Pixel Meteor. A smaller variant can be called Pixel Comet

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Boku/My Hero Academia © Kohei Horikoshi
Art by  ShoNuff44