I checked a couple things with Elindos.

• There is currently a bug where certain synergies (in particular, the Kumicho/Syndicate synergy) are incorrectly counted multiple times. It'll be gone very soon.
• Synergies only affect traits written on the cards. Despite his high violence score, the hacker does not get a synergy bonus for that.

Also, the scariest thing suggested thus far is an elite (+3) Captain Cranium (QL 10) with Repentant Pirate (+3 for Criminal, Violence and Low Morality), Syndicate Chipped (+1 with The Kumicho) and Narco-Warfare (+1 for Narcophile with The Kumicho) for a final QL of 18.

Upvoted!