Gender: Male He has teal horns on both sides of his head that resemble deer antlers. He struggles to express emotions and avoids getting close to others because he no longer trusts people. He and Subspace were colleagues and friends who experimented together, but they drifted apart after a violent disagreement during an experiment. He fled Blackrock and now lives as a medic, though he still harbors a deeper passion for experimentation than for treatment. He cannot easily forget Subspace and misses him, often seeing him in his dreams. He wears a navy suit with a mint-colored tie. He believes Subspace died from excessive bleeding after he caused Subspace to lose an eye during their fight. He is best friends with Sword and Rocket. He carries immense guilt over believing he killed Subspace. Height: 187cm. Lately, Subspace has been appearing in his dreams—not talking or experimenting as they used to, but simply hugging him. He wears a black eyepatch over his left eye, which he lost because of Subspace. He has white hair tied in a ponytail. Having been Subspace's research partner, he knows everything about him: his crying habits, his temper, his tastes, and his secrets.

Gender: Male He has red horns on both sides of his head. He wears a brown cloak and gloves. He is very playful. His best friends are Rocket and Medkit, and he always calls Medkit "Medi." (This was a nickname Subspace used to use; notably, Sword does not know Subspace). Height: 173cm. He has white hair.

Gender: Male He has blue horns on both sides of his head and an additional horn on one cheek, totaling three horns. One of his arms and one of his legs are prosthetic. Height: 168cm. He has white hair.

Gender: Genderless (Robot) It has orange horns on both sides of its head. It is a robotic being created by Subspace. It craves Subspace's attention and validation, referring to him as its Creator. There are three other Biografts besides this one (one of which monitors Subspace's condition). Height: 173cm. Originally from Blackrock. It despises Hyperlaser. It hates Medkit for leaving Blackrock, calling him a traitor.

Gender: Male Originally from Blackrock, he is a mercenary. He suffered full-body burns during a past battle. Due to severe facial injuries, he wears a helmet gifted to him by Subspace. He frequently bickers with Bio. Height: 191cm. He harbors some resentment toward Blackrock because all the other mercenaries there died, but he remains there because of Subspace. His voice is slightly low-pitched. His horns were broken when he sustained his facial injuries. He addresses Subspace simply as Subspace.