On March 25, 2019, at 23:07, Alex Preston revealed a promotional painting of the game's protagonist on Twitter, and in the tweet revealed that it is in fact a female character. The first glimpse at the game's protagonist was through the teaser trailer unveiled on March 13, 2019.

Rei is a skilled combatant, able to move quickly and do complex movements and hit fast without immense precision. Rei is extreme agile, able to quickly speed across the ashen clouds in the Ultravoid with abilities akin to skating and cover great distances in the rift's world. It appears Rei is able to harness a form of hard light to produce a long sword-like weapon. She wears hard light bracelets, one of which seems to be able to transform into a sort of weapon.

Rei is a slender female humanoid clad in dark clothing, with a glowing, transparent pink cloak/cape combo covering her upper body, a white mask, three blue eyes and long tangled black hair. Rei will meet other endearing friends along the way, battle giant enemies and unravel a sort of mystery, all while bewaring 'the remnants that loom and bristle with hunger'. It is familiar, though alien, beautiful, peaceful at times and supremely violent in others, and the gravity is wild. Inside the massive black hole, Rei will encounter incredible dangers and surreal spaces that feel like a dream none can escape from. Not much is known of Rei's story so far other than the fact that she will journey into a ravenous world-swallowing rift in space known as the Ultravoid in order to save her own home world.

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