About Luigi: I guess you're right. Doesn't really make that much of a difference I guess And oh I was talking about Fair and Nair's sweetspot. I still think Fair does too much damage for the move's frame data, though.
About Peach: I guess that does make sense too. I think her Fair is unexpectedly powerful in this game, but I'm also not sure how much it would hurt her (read: probly a lot) if it was slightly nerfed. She does have quite a bit of kill options in this game, though, so maybe it wouldn't hurt her as much.
About DK: Then dunno LOL.
About Diddy: Didn't I write up nerfs to his uair? I was sure I did. Anyways yeah more BKB, less KBG on uair, and the hitbox shouldn't be as ridiculously big as it is currently.
About Zelda: The thing is, Zelda would still have trouble getting in because Zelda. Even if nair-FW was a guaranteed finisher, I don't think that's necessarily too bad since she still retains most of her weaknesses. I don't thikn giving Zelda a kill confirm would be as terrible since 90% of her moveset is already really unsafe anyways. At least Nair shouldn't have the ridiculous amount of landing lag it does have.
About Sheik: I fail to see how a frame 3 move that is as disjointed as Sheik's fair is would end up being useless if it couldn't chain into itself more than three times. Seriously, frame 3, disjointed. Maybe up the damage by like 1% but that move is still ridiculous as ****.
About Ganon: I didn't say superarmor on Side B, though. More like the kind of armor Snake had on his Cypher, which was like a 7% armor or something like that. The idea is that some tilts and smashes could still cancel it out but not long-lasting multihit moves, etc. Superarmor on Wizard's Foot sounds okay I guess. The move is kinda difficult to intercept with an attack in any case.
Heck, tbh, if it was up to me I'd completely redesign Ganon and Zelda to make them more loyal to their respective incarnations (and more useful as well). In that vein, Ganon would be able to levitate, use magic projectiles, and would have a sword. But that's borderline fanwank so I'm not going there...
Other character thoughts:
: Fix her tilts not to be weird long-lasting multihits, but single hit faster attacks instead. The animations are fine, it's just that her staff doesn't have to do so many turns. Also, change Reflect Barrier to neutral B, Super Speed to regular Side-B, and Auto-Reticle to Down-B. Lightweight is broken as **** so I won't even talk about that one.
: Giving her more range comparable to C. Falcon's attacks (but not jab lol) would honestly make her a very good character. F-smash, D-smash, F-air (!!!), B-air, U-tilt, D-tilt (could have a range similar to Villager's), and maaaaybe F-tilt's front hitboxes need to have an extra hit bubble. Maybe give them all a sweetspot when closer to WFT a la Roy, but the extra range would help so much. I'd be wary of giving U-smash more vertical reach, but it should at least have sourspot hitboxes to the sides like Marth's and Peach's.
: Goodbye kill throws. Goodbye super strong u-smash. I think giving him an armor of like 4% on Spin Dash could help him out with zoners (cough Megaman) if you took away his killpower in lieu of the hit and run.
: Nair's initial hitbox that's close to MM's body honestly shouldn't be there in the first place. Same thing for jab. Focus on the projectiles for the hitboxes and his melee attacks for CQC, I don't see why nair and jab should do both while also keeping closing opponents away.
: Slightly more range on his smashes wouldn't hurt.
: Give him his b-air strings back, maybe dealing less damage, but he needs more combos in order to be a good character in comparison to Link.