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A reformed bully returns for his school reunion, falling into a deadly trap, as he and his friends are hunted down by an old victim.
Maybe... Although the name of the victim turned killer is known, so there's no mystery there.
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When a frustrated public servant is fired from his meaningless job, he decides to become a masked vigilante, protecting his neighbourhood.
I like this is the most out of your three as well, but it risks being dangerously close to being "Super". Why does np he need to protect his neighbourhood... Hope this helps.
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A kid named Jack who comes from a devout mormon family who all wear the infamous Magic Underwear starts going to kindergarten and starts getting bullied and after that he starts questioning his faith.
A little long... Seems to be missing an ending,
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After a suicide attempt, a girl meets a man in the psych-ward, claiming to be a captured superhero; she becomes his only hope for survival.
I think this explains the plot better: "When a suicidal girl meets an inmate calming to be a superhero, she must save him before his nemesis can gain control of his powers."