Power Born of Madness/Playing With

Basic Trope: Being insane has various metanormal benefits.
 * Straight: Jack has a looser grasp on reality than most. This lets him carry out plans that shouldn't succeed and spot weaknesses that don't occur to others.
 * Exaggerated: Purely by virtue of being insane, Jack is a Reality Warper.
 * Justified: There's an unstable energy source that insane people are more able to tap and control.
 * Alternatively, the power works by making the user's personal version of reality override the consensus version--only the insane and the ignorant can actually use it, because you have to outright believe your own version is possible in order for it to work, and normal people know it isn't.
 * Inverted: Jack is a superhero, and loses his powers when he goes insane.
 * Jack is hyper sane which allows for amazing feats such as being unphased by even an Eldritch Abomination and having impeccably clear judgment.
 * Subverted: Jack isn't clinically insane, he's just smart enough to look that way to most people.
 * Double Subverted: There's a thin line between genius and madness, and Jack crosses it a few installments into the story.
 * Parodied: Adventurers looking to fill party niches always begin by searching insane asylums.
 * Deconstructed: Jack's insanity is getting worse, and as it does, his power increases. Cue Face Heel Turn, A God Am I, or any number of things that can go wrong with immense power with an unstable mind behind it. His teammates are forced to terminate him before he threatens the rest of reality.
 * Reconstructed: Jack's power, and with it his insanity, can be switched on and off. He may be dangerous while 'in the zone', but can at least be aimed in the right direction.
 * Zig Zagged: Depending on the Writer, Jack is insane and skilled, insane and useless, brilliant and eccentric, or just unusually snarky.
 * Averted: No insane people have special abilities, and no one with abilities beyond the norm are noticeably insane. Crazy Awesome, maybe, but not insane.
 * Enforced: The story is an Author Tract about equal opportunity badassitude for people diagnosed with mental disorders.
 * Lampshaded: "Yeah. Figures the nutjob saves our bacon."
 * Invoked: Bob tries to drive Jack crazier in order to increase his power level.
 * Defied: No-one who is insane has super-powers.
 * Someone who starts getting a power-inducing mental illness seeks out treatment. Bonus Points if preserving the powers while minimizing/eliminating the undesirable parts of the insanity is the goal of the treatment.
 * Discussed: ???
 * Conversed: "You know, the world would be so much more dangerous if insanity came with supernatural powers..."