Jigglypuff's side taunt should be reverted to Gravity from 4.0b.
Gravity was a huge part of Jiggs' edgeguarding game, with particular mention to matchups against characters whose recovery also had the potential to do heavy damage and/or meteor (e.g. spacies, pika, marth, etc.)
While I can see the counterargument revolving around the controversy that is the windbox, its huge startup and long endlag make it easily punishable if the opponent has basic spacing knowledge.
(Regardless of that, the current taunt always faces to the left, which makes it worthless outside of a few niche cases. The only circumstance I've had come up more than once is disrespecting off of sing, which can be much better handled via throws or even rest.)
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Let Peach use other specials out of Side-B without having to constantly worry about not activating Toad every time.
I don't know if this may just be a bug, but unless Peach starts her specials really late into Bomber, it always results in using neutral B.
From a balance standpoint, I'd still recommend not allowing Bomber -> Bomber, because there are some really broken shenanigans that come from that.
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Heavily slow down Olimar's Side-B speed
Olimar has been honestly sleeper OP for a while, with Pluck X number of Pikmin -> Side-B every Pikmin -> Win being a completely unstoppable strategy provided the Olimar can remember to refresh Pikmin every once in a while. It has come to the point where Olimar has been banned at my locals and even in friendlies.
My proposal would be to add something along the lines of 8-9 more frames of endlag between throws, allowing the Pikmin to still be used as intended.
The few times I've seen Olimar used on stream, Pin Clock played him like he is in the other games, with which I have no issue, but that doesn't prevent others from cheesing.