Dreizehn/Hooks
Medic: Need painkillers, or something to make you sleep? Need patched up, when going to a hospital (or using magic) might be...inconvenient? Need 'spare parts' without the fuss and muss of collecting organs yourself? Rumour has it Dreizehn can help.
Scientists: He's got a bit of an...obsession. Need a lab assistant or tech? He has skills in medicine, genetics, biology, and is particularly effective in repairing equipment or jury rigging the machines a good doctor might need from scratch. On the other hand, you might find a stray lab rat poking its nose about your lab a bit too intently.
Ratkin: He is one. A very Weaverish one, and not typically liked by other rats because of this. But still, they're his family, and he'll help out how he can. Likewise, he's constantly struggling between his instinct (destructive and chaotic) and logic and order.
Technomancers: He'll probably want to meet you. A lot. In fact, he'd be very, very interested in learning about the Union's world view and values. Unfortunately, they might also want to murder him.