In no particular order, I'd say that the 5 easiest are:
![Mario :mario2: :mario2:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
- No duh. His combo game is very simple, his Fireballs are highly effective and teach the player a lot about projectile use and zoning, his finishers are great (DSmash is very fast, FSmash has a lot of reach with decent speed and Fair is super easy to combo into... it even combos into itself), he's a very potent edgeguarder with his Fireballs and Cape, has one of the best recoveries in the game, a good wavedash, etc etc
![Ivysaur :ivysaur: :ivysaur:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
- See above minus the recovery, though add the ability to heal self.
![Pit :pit: :pit:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
- Whilst Pit certainly needs a bit of technical finesse, I'd argue that he is still easy to learn. Anyone can tell you how to combo with this character as his combos are some of the most blatant autocombos ever. Dthrow is universally useful and easy to understand and utilise. His arrows can be spammed with little thought, his recovery leaves a lot of room for error and his KO moves are
lightning fast and easy as hell to combo into. Pit's really one of those characters where you have more to learn about how to achieve what you want to do, rather than what it is you want to be doing in the first place.
![Kirby :kirby2: :kirby2:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
- If you came from playing a Brawl character who utilised RARs (like Brawl Kirby or Brawl Wolf) you should already have good idea of spacing with Kirby. Either way, Kirby is pretty simple to learn and the most successful Kirby player I know of (Chudat) benefits from his intelligent play, rather than any character specific tech. Kirby's throw combos are basic enough and when they stop working, a simple mixup (eg. dash attack or Cutter Dash instead of Dthrow) is generally all that's required to get things going again. Good recovery, non-tech-heavy combos and surprisingly good defensive options. Kirby's main downfalls are his survivability (being floarty and the third lightest character in PM doesn't do him any favours. You can die at
60% just from Roy's FSmash lol) and lack of a reliable projectile. Doesn't make him hard to learn though.
![Sheik :sheik: :sheik:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
- If you have any sort of tech-skill, you can learn Sheik very quickly.
Again in no particular order, I'd say that the 5 hardest are:
![Jigglypuff :jigglypuff: :jigglypuff:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
- Yeah... Jiggs gets KO'd easier than putting food in one's mouth, has little reach, a non-existent combo game and her gameplay REVOLVES around hard-reads and trying to pull off one single move (Rest). Jigglypuff lacks options, and what she has requires a highly deep understanding of the how the other 40 characters fight against her.
![Ice Climbers :popo: :popo:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
- Have you got 5 hands? No? Well guess the ICs aren't for you, then. These guys have sloppy movement when not wavedashing and the desynchs that they love so much are not only hard to input but often hard to do from a mental standpoint too. You need to be very good at reading DI and will need to put in a boatload learning the trajectories of the ICs' attacks and positioning the partner accordingly if you want any hope of playing them. The stereotype of "just wavedash downsmash" is funny, but no-one ever won a match by following that advice.
![Fox :fox: :fox:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
- Nothing to say here. It's Fox.
![Wolf :wolf: :wolf:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
- Kinda like Fox and Falco, but without the reliability of either when it comes to certain moves (eg. Dair is only a meteor, not a spike, his Reflector/Shine can be CC'd unlike Fox and Falco's ones) and learning how to combo into Wolf Flash (an essential part of any Wolf player) is not easy. Gotta know how where characters end up after being hit, read DI, etc. Wolf also has a fair few techs that require frame-perfect use. DACUS has a one-frame window and the aforementioned Wolf Flash can shorten its length if the special button is pressed again with a window of 3 or 4 frames I think, each frame
shortens the move to a different length. If you plan on playing Wolf, you need to be prepared to put some time in figuring out his combo and punish games.
![Lucario :lucario: :lucario:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
- I originally wasn't going to put Lucario here, as I believe that people exaggerate his difficulty but when it came down to it, I couldn't think of one better. Lucario has a playstyle that is more reminiscent of traditional fighters and copious amount of character specific tech. No fundamentals and general Smash knowledge can help you here. You have to learn what makes Lucario what he is.