All The Tropes Wiki Project, Part XII

[classicdrogn]

(Ron) settled the mental dissonance by reminding himself that Minister Fudge had been a Slythirin.

Smart enough to invent the Terrifus curse. Brave and good enough to have his own Fear curse outlawed the moment he realized what he had done, even if it meant he'd forever be remembered as the creator of the fourth unforgivable.

In the most recent part of Power he knows not [Harry Potter/Familiar of Zero], Quickdeath007 writes about this event from Fudge's perspective, weaponizing his weakness by forcing his fear out onto an attacker. Ya got a trope for that? I did some searching with "weaponize" and "weakness" but but mostly came up with things that amount to taking advantage of an enemy's secret/embarrassing/etc. weakness, rather than turning the user's personal failing into a weapon. It might be a theme too uncommon to consider a trope, since the only other examples I can think of per se are 'powered by perversion' characters like Happosai, whatsizname MC from City Hunter, (arguably) Kirche von Zebst, Issei Hyoudou, etc., or maybe 'powered by prudishness' like Naru and M-something-sword-girl from Love Hina, which would count but undoubtedly have their own specific cases already.

Can anyone suggest more examples that wouldn't already be covered well enough by an existing trope, or one that this does clearly fall under? I'll admit I'm mostly just hoping for some more things to read with an interesting 'turn things on their head' moment, but the academic curiosity about the theme in its own right is there.

e: Grrr, accidentally double-posted instead of editing somehow. Deleted the extra.