Mii Brawler: No idea
Villager: -1 (and probably my most boring MU lol)
ROB: 0
Pac-Man: No idea (have yet to face one)
Mega Man: -2
Peach: +1
Wario: No idea (haven't faced one that isn't a bike spammer -__-)
MK: +1
Greninja: +1
Lucario: +1
Pit: +1
Olimar: 0
I'll give a decent write-up on MUs where I have a fair amount of experience lol.
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Villager zones us out really well and I find practically everything about him stupid lol. His campy game is stupid (slingshots and Lloid), the power on his tree growing is stupid, his tree is stupid, the fact he has time to Pocket it if we reflect it is stupid, his OP recovery is super stupid, then the bowling ball and Pocket gimps are really stupid.
Ness can actually get around the Lloids so that we aren't forced in mid-air for him to slingshot us though; PK Fire is an option and we can bat it if we wanted. Also anytime you see him riding the Lloid, BAT the damn thing. If he doesn't react quick enough he'll either die from going into the blastzone or the
Lloid explodes on him and will likely KO him lol.
Also, we really don't care what projectile of ours he Pockets as long as it's not a PK Thunder as we recover. Send out a PKT? That's really easy healing for us or we can bat it back for a KO move. PK Fire? Either heal or even if we get hit it's pretty easy to escape. He can't Pocket PK Flash either lol. I usually throw out PKT in neutral and they tend to Pocket it. Now I can either heal from it or they just take PKT damage, and choosing to hold onto it in fear of healing us means they can't Pocket gimp us.
In the air is a problem against Villager, since his aerials trade better than ours. He has a Frame 2 Nair (more silliness), and the slingshots and his turnips that pose an issue for us. Something I found interesting though, I DID reflect a close-up Fair at the very ledge that KO'd at about 70% in tourney friendlies (sadly no video lol). Might be worth noting! Not sure what I can say about the aerial game here, any of you Nesses mind helping?
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Mega Man is a pretty annoying MU. He conditions and zones us REALLY well, and so we're forced to approach, but he can disrupt our flow VERY easily. All his absorbable projectiles are usually not even worth trying to heal from, since he conditions us really well as I aforementioned. For instance, the Crash Bomb is set on us. Now, we could get away from him and try to heal from it (it explodes in about 3 seconds), but that's a measly 1% heal and he can fire a Metal Blade for us in the meantime. We could try to pass it to him, but again, more Metal Blades or we get hit by a Bair. Shielding it can get us grabbed, which adds to more frustration. Also, the Metal Blades can be SUPER confusing since he can throw them in any of the 8 cardinal directions, and one of the things I couldn't get around was that he would run from me but fire it backwards as he was running, or just right into the ground. Mega Man's aerials are no joke either due to their disjoints, and you'll find yourself taking lemons the moment you get close. I would also suggest to not be above Mega Man either since U-Smash and D-Smash are very deadly.
Frankly I'm not too sure how to get in, but you can get good damage once you get the ball rolling with PKF, Nair and grabs. Also it should be noted that his recovery does no damage, so we can take advantage of that.
(Again Nesses, please help me lol)
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Peach is a fun and a rather interesting MU. She loves her Turnips and her float game can cause some serious baits. Many Peaches get a Turnip in hand and then they proceed to come at you with Dairs to start combos. However, Peach has a weakness to horizontal pressure, and our Fair is just handy for that! She has little horizontal protection (Nair and Bair are short ranged), while her Fair is kind of slow (but don't trade Fairs!) and moves slowly herself. We can also weave in and out with our own Nair.
Like always, if you're above her, don't be. Her Uair hits twice and can KO decently, while Parasol is also an overlooked finisher. We also need to watch out for Turnip baits, so don't always airdodge if you see a turnip or her coming your way. A common thing I do as Peach (I do use her) is that I throw a Turnip upward then expect the airdodge and then cover it with the U-Smash. Also with edgeguarding, most Peaches tend to throw it up past the ledge or Z-Drop it, then jump again to Fair for a finisher. However, we can KO her way easier then she can KO us, since she's really light and usually when you Fair her you tend to knock her out of the float, AND tailwhipping works wonders against Peach. I tend to net the KO with Uairs or Bairs, but our famous B-Throw does just as well.
Some other quirks I should mention are that her Peach Bomber is a good tech chase tool and is usually safe on shield. Her grab range is kinda lame, but her B-Throw can KO at a decent % as well, and she can do D-Throw > U-Tilt/F-Tilt/Bair/Uair. And oddly, reflecting a turnip or catching one can kind of open up some strings for us, so it might be worth using an F-Smash from time to time. Speaking of that, if you see the Toad, F-Smash it; you hit her with it AND reflect the Spores. Finally, she can pull up a Bob-Omb or a Mr. Saturn; we can absorb the former now and the latter breaks shields, so don't shield if you see the Mr. Saturn lol.
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Yeah I got nothing else to say on the other MUs, but question for Olimar - what is the best way to get rid of Pikmin? I wish Nair would do again but it doesn't always do so and I don't like staling our Uair. Or is it the only practical choice?