Some suggestions now that I've had a chance to spend some time with Q:
Yoshi needs some approach options, as he gets shut down really hard by alot of characters. It would be a huge help if he could actually combo out of bAir and dAir. They are both hard to hit well since they don't link properly, and have no followup (you actually get punished on hit sometimes). Some super armor would help the egg roll alot too.
Pichu is...unusable. Intentional, perhaps?
Mario's nerfs are serious...his KO power is borderline low-tier, and the decreased damage stacking doesn't help. With the exception of matches where the cape is used heavily for gimping/projectiles, Luigi is completely superior, and Luigi is hardly high tier.
For both bros, firebrand/thunderhand are completely useless. There is NO CASE where either is the best option over all other available moves. Just remove them...it's disruptive when you throw them by accident.
Zelda is definitely OP. Her boxing is phenomenal, and she completely rules from a distance. She has instant mobility with the warp, and her recovery is very safe as long as you can aim. An approaching reflector even allows her to dominate the few characters who might try to fight her from a distance. Why is her boxing so strong when she is clearly designed to be a ranged fighter?
Bowser's armor is really hard to deal with online...maybe it is less of an issue offline. Perhaps the window for teching RRdown could be increased?
Falco's reflector is far too powerful. Not only does it shut down physical approaches, but it also sets up, and is totally safe to throw. It should either only reflect projectiles, or only hit physically (and even then, not drag the opponent back to Falco).
Charizard's upB is insane, and KOs <50% easily...he has too much longevity and power to possess that kind of early kill potential.
ZSS feels good, but she relies very heavily on uTilt spam to start combos. Maybe you could give her more variety by reducing its power and making her throws better setups (even dThrow can be DI'd to a safe distance easily).
Regular Samus power bombs are more or less unusable. Maybe if the hitbox was bigger or the explosion lasted a few extra frames. The new screw attack feels janky, but it works. I think her zAir may still be causing desyncs or even crashes. Missile canceling is hard due to her fall speed, but her improved melee makes up for it.
Snake should be able to do his air dodge grenade thing.
Captain Falcon's knee chaining into itself is ridiculous. Offline, he can 0-death a number of characters quite easily with it out of a chaingrab. Maybe you could make his dThrow techable, since it is so easy to land and follow up on?
Toon Link's boomerang KOing at 150% is not really necessary. He shouldn't be able to poke for KOs when he controls space so well.
Sonic completely destroys a number of characters, yet is destroyed by TL due to the polarizing nature of his high pressure/hitstun game. Maybe he should lose some combo potential in exchange for better KO moves.
DDD is dumb dumb dumb. Waddle Dee command is a cool idea, but the implementation is horrible. They just soak up EVERYTHING, and it makes for alot of horrible matchups.
I actually don't think the faster boxing makes that much of a difference for Link, but I tend to avoid boxing with him as much as possible anyway.