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I have the Splicers RPG book, and I've noticed there are no O.C.C.s for ordinary humans who have not been modified by Biotechnology. I'd use the Vagabond, City Rat, and Wilderness Scout O.C.C.s from Rifts to provide RPG templetes for the majority of humans in the Splicers world, and use the Rogue Scholar and Rogue Scientist O.C.C.s from Rifts to provide character templetes for the human Engineers who provide Biotechnology in the Splicers world.

Based on the House breakdown in the section for the 1 above ground House, I pretty well treat anything that's not a Splicers OCC as noncombatant. if you absolutely need more than what's available in Splicers, I'd recommend the BtS2 profession chart for the average citizenry of a House.