not entirely sure what you mean. i do remember reading a character or two that did seem to have what it sounds like already. initial reaction to what you mean is Kurama-esqued intelligence during combat, though the furthest extreme i could think of is Amadeus Cho in Marvel. but that's well beyond even the high end.
realistically, it's still the same kind of thing as any other character - that's a power. in Cho's case, his weakness is a pretty simple one: he's still completely and utterly human. in Kurama's case it's a matter of shounen power levels as he could still be injured if you were on par or if you managed to trick him/distract him somehow. you can also equate this to guys like Iron Man too at times. or you have stuff like Saber where her skill gives her quasi-precog-that-isn't-precog, yet she still would've lost to Lancer without interference due to his ability to predict actions in the future via raw skill and speed. in all cases, it's a power, so really it depends how well they'd fit. biggest things that come to mind are the basic questions; how does it work, what can it do/has it done, etc.
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"Maybe it's a tentacle, molesting the planet itself. - Aschen Brodel.