Knowledge skills would probably be things like guerilla tactics, corporate politics, corporate security, underworld politics, safe houses, Seattle black market, pirate tridnews, and so on. They would tend to be practical knowledge rather than hobbies.
Active skills would be a problem, since there are too many "any shadowrunner would know this" skills - so you would have your specialty, and then lots of low-rated skills. Karmagen, where low-rated skills are cheaper, would be your best bet for this type of character.