Skill monkey. I'm going to try and get an ability roll with as high an intelligence score as I can get away with. They'll also be human.

As a note though: I have a specific character concept in mind, and I don't intend for them to put points in Bluff, Diplomacy, or Intimidation - so we'd need somebody else to be the face.

Possibly a Sorcerer, since we're also lacking for control?