Other characters. A polycule of nonbinary lovers who had their brains fused together an installed in a single body so they could experience togetherness with greater intensity.
Quantum witch who has figured out how to store her nightmares, intrusive thoughts, and crippling depression into patterns compatible with human neural impulses and can project them in the form of hexes onto other people, or reverse the process to siphon thoughts.
Guy who had his entire digestive tract cybernetically enhanced so it constitutes over 1/3 of his body mass but he can use all his organs as extra limbs or attack with them like a starfish throws its stomach at its prey.
Retired military robot whose brain is a daisy chain of forty rat brains who is still trying to get its personhood legally recognized and resents not being able to do anything for itself without the aid of a "service human" who legally speaking technically owns it as a pet.
Guy who has had his entire skeleton replaced with a network of low level AI centipedes allowing him to react at incredible speeds and move in ways that shouldn't be possible.
House sized anthill which lives underground and interacts through a series of dozens of drones which can temporarily assemble into a humanoid shape if needed.
Orca who had most of her body destroyed by a depth charge during one of many surface wars and had her head and remaining spine installed into a colossal multiarmed mech suit to be able to collect the disability compensation after she sued, and uses it to maintain a coffee bar and support group focused on civilians injured in military or police actions.
Guy who installed entropic conversion units at key joints of his body which allows him to become super fast, hyper intelligent, super strong, and indestructible for ten minutes, but anything within a ten foot sphere around him at the start gets turned to ash.
Human / mosquitos hybrid with a small scale nanoplant mod in their throat. They can treat any injury or illness on themselves or any other organic entity provided they have something healthy and alive to drain the resources from, or are willing to dissolve parts of their own body, which they can regrow later but it's very painful.