Dumb idea: BEING A TRIBAL. And then being able to tag shit like Energy Weapons from the get-go. Explain to me how the fuck a stupid tribal has an innate affinity with a Turbo Plasma Rifle, and why the hell that Turbo Plasma Rifle is nowhere to be found in the village (and how the hell a tribal in the middle of nowhere got his greasy mitts on a weapon like that!).
Dumb idea: IN>4 and Science tag being able to coincide with one another. What, did this 'tard read a Big Book of Science and manage to process and absorb the information within? "Oooh, me like science! Me know all about Newton's Laws, and electronics, and good stuff like that!" Never mind the fact that he probably can't even SPELL science.
Probably far from the dumbest ideas ever, but 2 examples of the character origin, SPECIAL score, and Tag skill being mashed together in ways that don't make sense.