Q is perfectly fine, unless he got some very stupid powerups in novels that I've missed. There is no upper bound for power - so long as the character fits all of the rules I included in the OP.
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Currently playing: League of Legends, Chrono Cross.
Current Projects: Fool's Overture, CYOA: http://www.gamefaqs.com/boards/8-gamefaqs-contests/60143513