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* Like most of the characters in ''JusticeLeagueInternational'', BoosterGold underwent a fair bit of [[{{Flanderized}} Flanderization]] in the title. He started off as a fairly likable, competent hero in his own book, but got progressively stupider and more vain once he joined the Justice League. It's even {{Lampshaded}} in ''Formerly Known as the Justice League'', where BlueBeetle points out that Booster used to be fairly intelligent, and accuses him of acting dumb and childish on purpose. Later on, it is confirmed to be (mostly) an act.
* {{Deadpool}} did not start off as stupid as he's famously depicted as being, and in fact was more of a standard mercenary in his first appearance in ''{{X-Force}}''. The whole "Dumbest guy on the planet" personality didn't really come into effect until he got his own solo series.
* Princess Leia in the comic adaptation of StarWars novel ''SplinterOfTheMindsEye''. In the novel itself she is a ShellShockedVeteran (leading to some {{Jerkass}} moments) but very smart and cosmopolitan. The comic cuts out a lot of these scenes leaving Luke to make essentially all the plans and guesswork, so Leia comes across as a little slow on the uptake.
* {{Superman}}'s IQ seems to drop a few points whenever he's with the Justice League, or more specifically whenever he's around {{Batman}}. Then again, Batman seems to have the power of making other characters dumber just by being there.