ohohoh HO baby my favorite matchups. I know a trick or two that goes a long way vs them, but its all matchup specific.
Ness: Smother, you got it. Once you get close to ness things get much easier. Once you get him offstage, he should not be coming back. Fsmash jump to ledge and air dodge to ledge, if he ever PK thunders offstage swat him away or counter.
Snake: React to what he does and practice good spacing. If snake pulls a grenade face to face with you, he will hold the grenade behind him, most options hit him safely as long as you dont get close enough to tap the grenade to his rear. If snake pulls a grenade with his back facing you, grab or down tilt as they won't hit the grenade, if he jumps you can up tilt his feet. If you ever get a grab on him when he pulls a grenade you can pummel and time the blast with your throw invincibility to stay safe and get extra damage on him (very effective vs snakes that like to do a lot of grenade > shield or any form of grenade pickup). When you get him in disadvantage, keep him there; if your spacing and positional awareness is on point, you should be able to keep him off to the side or in the air for a long time and it wont take much for an up air to kill snake the way lots of people recover with him. The really hard thing to deal with this matchup is up smash at the ledge. Ideally you should be able to avoid this almost entirely if your spacing and positioning are on point, but if you ever get put into the situation, its mixup time. you can get up counter (will knock him away far enough for you to get your feet on the stage unless hes at 0%) you can time a jump and drift back to do a landing mixup, and if you manage to get back to the ledge fast enough, you can get up attack before he fires his first shot.
Wolf: Edgeguard and play defensively afterwards. TL;DR, edgeguarding wolf is fairly undeveloped and unrefined among our main(s) despite being the key to take control of the matchup. I posted an explanation on how to do it in the (Lucina mains, what characters give you the most trouble) thread. Along with said edgeguarding tricks found in the other thread, if you ever get a lead vs wolf dont press on into him. Blaster by itself is easy to dodge and wolf will eventually be forced to approach if he doesn't wanna be timed out, once that happens the game is yours since dealing with wolf defensively is FAR easier than being the one going to him.
Villager: This ones actually similar to ness but with a few extra steps. Essentially, edgeguarding him is harder, and you want to shield more when you're close up to him. Take advantage of your good OOS aerials, shield run into jump to mix up approaches, cut through his fair and bair with your sword whenever you find that right distance, and the matchup gets a lot easier.
Also cant believe I didnt see this thread before lol, just realized how long its been sitting for.