Aiah grew up an orphan on the crowded Orion-Five Space Colony, a corp-controlled station with little time or tolerance for unproductive mouths. She fell in with the local gangs from a young age, learning to make herself useful to them to survive; first as a lookout and scrawny pickpocket, and later as a hacker, a friendly ghost in the corporate main-frames. Everything on Orion-Five was controlled or monitored from somewhere, and so Aiah learned to trace those connections, to make them see what she wanted them to see and do what she wanted them to do. Life was never easy, but it was under her control.
Until she met FENRIR.
At first Aiah thought she'd just found traces of another hacker lurking within the corporate datalines. Curiosity led her to reach out and make contact; that soon led to a sharing of information, an alliance, and a strangely anonymous friendship. Eventually, Aiah asked if they could meet in person, and that's when she learned the truth: FENRIR was an artifical mind, an illegal non-human personage created for purposes she could only guess at and currently being studied on the station.
They wanted out. She agreed to help. Things did not go according to plan.
Backed into a corner, Aiah took the only option she could think of and downloaded FENRIR into her own mind. The last thing she remembers clearly is initiating the transfer; after that is a whirl of colour, and data, and pain. She woke to find herself covered in blood, drifting just within sensor range of a jumpgate in a barely functional mech that she shouldn't have known how to pilot, but did. Only a sliver of FENRIR's core personality had survived, offloaded onto a casket inside the mech, but she could still feel their fragments inside her, secrets which weren't hers to know lurking at the corners of her mind.
Aiah and FENRIR have lived on the run since, taking jobs here and there to keep themselves running and to keep FENRIR housed in a decent frame, and generally doing their best to stay below the radar. The Tannhäuser contract fits the bill perfectly; decent pay in some out-of-the-way hellhole where nobody would have reason to look for them.