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From what I can gather, Character Exaggeration is supposed to be for characters who are flanderized across adaptations. So the Shadow example you cited would fit under there instead of Flanderization.
I would assume that if someone acts out of character in a filler, it would count as Character Derailment or one of its sub tropes, but not Flanderization or Character Exaggeration. If we don't have a trope for a temporary out-of-characterness, we probably need one.
Edited by pikachu17 17 pikachus all in a row.

Is there any forum entry to fix Flanderization entries? I noticed that multiple entries are less about flanderization itself, but adaptations. For example, "Oh yeah, Shadow was totally flanderized"... except he wasn't, this is a different interpretation of the character.
This is also a question how exactly flanderization works in adaptations like anime filler, since there is no source material to adapt for the writers.
This is also a problem I have with Character Exaggeration, as the difference between both appears to be blurry.
Edited by Tomodachi