Jigglypuff is hardly slow in the air. And she has such great mobility to be able to weave in and out of attack range that she doesn't really need a sweet spot...It's like giving one to Fox.
From what I recall, Ike already has a sweetspot closer to his hilt like Roy used to.
And Ganondorf... yes. Only his usmash has one I think...
Aye, but I mean the majority of their moves. Jiggly is such a light weight character (the lightest if I'm not mistaken), and the majority of her moves do average damage/knockback at best. Getting the KO with something other than rest or a gimp can be really difficult at times. I am aware of the hilt of Ike's blade, afterall I do main the fellow, but seeing as he's a spacing character, that's kind of a weird place to put it. And I don't think any of his aerials actually have that same sweetspot at the hilt, only his Smashes...He also has some shenanigans on his Eruption attack as well as his Aether, but those moves seem so obsolete most of the time. Gannon could use an extra couple percentage points when timed right, especially on his aerials.
I dunno, maybe the sweetspot isn't the best thing to give these characters but I feel like they have a disadvantage in regular play compared to other characters. Some sort of gimmick would be nice.