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Exactly What I Aimed At probably applies
This signature says something else when you aren't looking at it.
Willfully Weak? there is also A-Team Firing
Edited by jormis29 Working on cleaning up List Of Shows That Need Summary
Willfully Weak sounds like the best bet. Especially if this includes cases where the person's attempts to control an aspect of their strength weakens them much further than they intend (again like how Akari just tries to avoid kill-shots but winds up unable to hit anything at all). A-Team Firing is a result, but there's no intent there. Exactly What I Aimed At is more playing with this trope. That trope is for someone who's aiming at a special target no one thought of, while my query was about someone simply trying to avoid hitting someone/something.
Like the title, what's the trope when a person's aim is deliberately off the mark, as in they're either trying not to hit at all or they're firing wild in their attempt to avoid certain hits. An example of the second is found in the Double-A season of AriaTheScarletAmmo, with heroine Akari. Akari seems to be insanely inept at firearms, unable to hit anything at even point-blank range. Then it's revealed that she's actually got perfect aim, to the point that she can point a gun at a target and hit all lethal points without even looking. But she doesn't want to kill, so she tries to avoid those points that she instinctually targets, and the effort results in her not hitting anything at all.