I just play Mickey.
Guy whom I used to work with when I was in construction. The drugs had fried his brain (particularly LSD).
He could follow simple instructions, but didn't have very good judgement at all. Things had to be very clear, or else you got "mickey's look of stupified amazement" a slack jawed look of pure stunned incomprehension.
I'd limit the common sense aspects too.
Intelligence in Hero terms seems to be as much about speed of thought as it is about breadth of knowledge (which are covered by skills). You think faster, hence respond faster, hence have a higher Per roll. You think faster, hence have a higher ability to recall information (have higher skills).
Slowing down your thought processes should make running your skills much worse. I'd recalculate all the skills based off his new Int. Or, hmmm, maybe just make them all Familiarities instead.
Unless of cource, the character is an idiot savant, then all bets are off.
D
Nathan, after rolling his 6th consecutive 15+, crosses out the name on his character sheet, "I'm now Chris, the Gestalt of Incompetence."
Chris, sitting next to him, "Grrr."
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