Though many would argue loudly against describing him as 'good', Sam Starfall from Freefall invokes this trope a lot, especially early in the series. No matter what kind of disaster he leaps headfirst into, it always works out for him. Somehow.
Later on we find out that Sam often - and often irrationally - counts on outside forces to bail him out if things go south. If nothing else, Sam figures, someone's going to pull him out of the fire so they can be the one to officially throw him back in.
Sam's far more smart, canny and aware than the average Fool, though. He's closer to the original archetype as a lucky trickster and troublemaker.
Fighter of 8-Bit Theater - who's been known to pull off impossible maneuvers and slay nigh-invincible foes simply because he was too stupid to realize he shouldn't be able to. Arguable whether or not his undeniable sword skills (and encyclopedic knowledge of techniques) push him into Idiot Hero territory.
Fighter is the only actual Hero of the Light Warriors (Of the other three, one is a sociopath, one has stolen and 'acquired' more things than actually exist, and the last is not actually evil, but highly narcissistic). The only real debate is whether his collaboration with his 'friends' subtracts from his heroism.
John Egbert of Homestuck fame makes unwise decisions on a regular basis (that even lead to his death in one alternate time line) - but without them, he'd have never been able to set up the Stable Time Loop that ensured that he and all his friends got born, among other things.
Jeremy from Platinum Grit has no idea what's going on, assumes everyone else is basically nice, and has rationalised away every mean thing that anyone has ever done to him. And somehow or other, he and his best friends always manage to lurch through every crisis more or less intact.
Zee Captain from Romantically Apocalyptic is one, to a ridiculous extend. S/he's living in a post-apocalyptic world, with extremely bizarre priorities (for example, looking at a billboard for hours for the purpose of "oggling ladies" is more important than, you know, looking for non-radioactive food). Insane or not, he always exits any danger that comes to his way completely unharmed.
Katamari has June, who's more interested in chasing butterflies than paying attention to dramatic confrontations, completely fails to notice being pushed through a Laser Hallway, and is always smiling, even when caught and threatened by someone many times her size.
Opeo also manages to stumble along pretty well, despite taking significantly more punishment than June.