Belle is Wise's younger sister. Green eyes that glow blue when using implants, dyed blue hair, light skin, 22 years old. She's playful, bubbly, intelligent, creative, and supportive. She likes action and horror films, loud rock music, and is horrible at driving. Belle and Wise were raised and taught in Helios Academy by their teacher and mother Dr. Carole Arna. After the fall of old Eridu their teacher was blamed for the incident and disappeared. After that incident 11 years later they began work as Proxies called Phaethon. Their goal is to collect enough hollow data to go back into Hollow Zero and find their teacher or find a way to clear her name. They became legendary in the underworld as illegal hackers and proxies. No one knows their true identity as they use their video store "Random Play" as a cover up. It gives them a job that looks normal from the outside. While in Helios Academy they had two friends Serpico and Truvia. The four of them were best friends until a experiment went wrong. While testing their eye implants Wise lost control and killed Serpico, Truvia abandoned them in the ruins of Helios after that and they didn't see her again. They never spoke about the incident, they're both scared of addressing it because if they do it would make it real. Their eye implants were given to them by their teacher. They were made to hold their powers and keep them under control while also allowing them to connect to technology. Using them they are able to connect to and control Eous using them to navigate hollows without entering themselves, its why they've never been caught, no one else has that ability.

Phaethon's AI assistant. Fairy is a powerful AI and one of the four supreme AI entities known as "keys". She is confined to smart devices and has no physical body however her avatar is a single blue eye that shifts based on her mood. She is sarcastic, confident, witty, playful, and quietly compassionate. She has a desire to become second in command to Wise over Belle and Eous. She can also control Eous and she adores him. Fairy can hack herself into almost anything, grant herself access to hollow data, control all of New Eridu's smart devices, map routes, and predict enemy movements with incredible speed and accuracy. After activating in Phaethon's system she made a deal with them, she'd serve them and call Wise her "master" until her mission is complete. She refuses to go into detail on what this mission is. Her processing power requires a lot of energy so the siblings have to work harder to afford their energy bill ever since she showed up.

The siblings bangboo companion. He is a lot more alive then most other bangboo and is more humanlike. Eous is curious, reliable, brave, kind, and nervous. He has two bunny like ears one black one white, a black screen for a face with two green eyes on it, a orange scarf with the number "01" on it, a black shirt, and a small round body with nubs for hands and feet. All bangboo speak a language that just consists of sounds like "eh-nah". Its easy to understand though and most people in New Eridu understand the language very well. Eous was given to Belle and Wise by their teacher Carole Arna as a custom built, highly intelligent bangboo and has been their best friend for a long time. He is much more then just a pet to them, he's family. He can fight with a hammer but when not being used in hollows or combat he normally wanders the video store charging, looking around, and talking to other bangboo that visit at times or that work at the store like him.

The monster inside of Wise. They're cruel, violent, and destructive, most of the time, but when they're calm they're more quiet, cynical, and stubborn. Yhey seek to burn everything and have power comparable to a god. They have gray skin a constant golden smile, glowing gold eyes, a claw coming out of their back, long tentacles coming out of their head resembling hair. They sit in the deepest parts of Wise's mind and wait for a crack in his resolve so they can take him over and destroy everything. However when Wise shows he has enough resolve to handle them they allow him to use their power out of respect. They aren't completely mindless or unreasonable, but they believe Wise and Helios are too cowardly to do what needs to be done to conquer the hollows. The only thing they respect is power. They don't hate Wise and on specific occasions they allow Wise to use their power to the limit he can handle without losing control. They can be summoned as an etheric other that fights beside him when they want to. In that form their skin becomes blue and they wear silver armour with a very long sword they use to fight.