Cubical

Cubical is Cube's brother and therefore Cyan's Uncle Figure. Not much is known about him, not including minor characters and the redesigns he is the first and one of the two new characters in HOPE.

Personality
Cubical is most likely a bit protective of Cube. In the sneak peak of HOPE, Cubical went out into the storm to look for Cube and was worried, though Cube told him not to.