I'm mostly with you for S/A, I'd say Fox and Yoshi are a bit higher. (imo yoshi is top5 worthy but it's just my opinion.) The rest if placed well.
Fox I do think could possibly be higher, I could actually see both Yoshi and Fox over Ness for example, its just Ness has been getting insane results practically everywhere so I cant really reasonably find it in myself to drop him any lower. As for Yoshi, the main reason I dont have him higher is because I just straight up think Ness/Brawler have better top tier match ups than Yoshi, mainly just because Yoshi gets somewhat bodied by Sheik. While I think Brawler/Ness/Fox/Yoshi/Rosy are all roughly similar ranking wise, I think Yoshi has the worst match up of all of them in that Sheik MU, and Fox just has more disadvantages than the other 4. ZSS I feel like is definitely the straggler of A tier, but is only behind by a VERY slim margin.
I'm kinda ok with B Tier even if I think Greninja got so hurt by the patch he doesn't belong there.
I actually think I might be overrating Gren a bit still, just that nair > follow ups and his disjointed smashes are still all fantastic, so I feel like is still really solid.
C, I'm not sure if Gunner belongs here but whatever, game goes for Ike.
Gunner is crazy good, I really wish someone could show her off so people know what I mean, but with Mii's being scrutinized with possible bans and the fact that Brawler is just so good, she's rarely played. I honestly could even see Gunner going higher, but I actually really like where I have her currently. As for Ike, Ike has huge damage output and TONS of small 2-3 hit combos off practically every hit. Add in a solid foosties game, kill confirms, and really solid poke options, so long as he isnt heavily outmaneuvered or zoned, he's super strong, literally.
I'll do the rest quickly : Imo Marth and Pit are far better than you give them credit for : Marth still has a good spacing game, excellent aerials, his real problem imo is that the High Tiers are mostly characters that really pressure him a lot thus making his Spacing Harder. Same goes for Pit, he has to be higher, he has a good combo game and can edgeguard a large portion of the cast with no risk involved. (Imo Dark Pit is 2 or 3 places below because the Arrow changes really matters on some matchups where going offstage would be putting yourself at risk. (such as when having to challenge ZSS' down B.)) Imo Marth/Pit are B tier, but take my opinion with a grain of salt.
The Pits just feel... A bit lacking to me. I mean, they arent bad, they just lack damage output, kill options, and they seems just a tad too lacking in most match ups from my experience. And as for which character is better, Ive heard DP is slightly better from the majority of sources and Ive seen more results from DP, but regardless the differences are really miniscule so I still feel theyre pretty interchangeable. I feel like the two of them are more a flex option for Pit/DP mains to play both and have small differences for match ups preferences more so than totally separate characters since theyre just so similar.
And Im gonna combine the Marth stuff with Lucina in the next part.
Lucina deserves to be a lot closer to Marth, she is technically inferior but still
Marth and Lucina are two characters that I took a REALLY long time to get an opinion on, I had no idea what I thought about them for a long time, and ended up playing tons of games as them to figure out what I think, and imo Marth feels a bit lacking, but not awful. He's very similar to Bowser actually (who I go into more detail on in the link in the next part), while he has great defensive options, good disjoints, etc, and he has good offensive options as well, but the problem is he really lacks any way to actually get in, and he lacks a way to force an approach to take advantage of his defensive options as well. As for Marth v Lucina though, Marth is leaps and bounds better, and its very VERY noticeable. Marth has better combos/follow ups/traps thanks to the lower knockback on non tippered moves, Marth does more damage when you DO tippered moves, Marth is safer on block, Marth has more range, and Marth kills earlier. Marth just has better traps, more options with the tipper options, and is straight up safer, whereas Lucina just straight up has less options and is FAR more vulnerable. I really do think the differences make Lucina a ton worse.
Dedede, Jig, Bowser are a tad too low, Dedede was, and still is a defensive behemoth despite the patch nerfing him, he is in my opinion a really extreme character : His matchups either are **** or really good, thanks to the traps his side b can permit. Jig has a good combo game, she is hands down the best edgeguarder and Rest is a very, very good punish. (I heard DAir > Rest is a combo, I'll have to check when I get the wii u version.) Bowser neither is a defensive behemoth or a combo master, but his attacks are decently fast and absurdly powerful, making his punishes good, he is relatively mobile and his attacks have a large hitbox, enabling him to space a bit, he is far from being top (He is comboable, some attacks are very punishable and his vertical recovery is far from being the best.) but imo he isn't so low.
I actually play D3/Bowser (or used to with D3 up until like 2 weeks ago lol), and imo characters with extreme match ups generally arent as good competitively. They're cool pockets, but you cant take tournaments with just them since theyre so easily countered, and since a tier list is ranking competitive viability, I dont think a character who gets bodied by so many characters like D3 can be anything higher than where he is. D3 is just too unreliable of a character is all (this is the same reason WFT is so low just FYI). Bowser I made a post on earlier here and I explained it pretty well:
http://smashboards.com/threads/character-competitive-impressions.367669/page-177#post-18110062 Jiggs, ehhhhh, Idunno, she just seems lacking to me. She's easily one of the characters Im the least knowledgeable on, but I dont see her going much higher. Maybe over Mario/Pit/DP, but thats really it. I dont have much to say on her, could be totally wrong about her.
Jr. should be higher too, his Side B is the move that makes a Jr. player good : It's good for mindgames, it starts comboes, it makes him overall very mobile and applies pressure. His Down B is a good tool for stage control (Like throwing a koopa on Smashville's platform essentially denies an important part of the stage from your opponent.) He really is BEEFY so that's good. His real problem is the actual killing, without a read with a Smash/Up B or a Bair edgeguard it's really hard to kill with Junior, besides his attacks can be punished if whiffed. but really he isn't that low.
Ive played against a ton of BJ, and I just think he's too gimmicky. His projectiles are too slow and predicable to reliably force an approach, his combos, while good, are difficult to start without specific set ups or reads, and he's real slow without side b, which due to how reliant on it he is, ends up being just a bit too choreographed. Also, the fact that shield can body side b is huge, since, unlike Sonic who can cancel his dashes into shield, and therefore grabs, BJ cant really pressure shields with anything, he has no safe approaches on shield, and he cant force approaches due to his slow projectile game. Mecha koopas are his saving grace, since theyre real good, but theyre all he really has outside of kart mix ups.
Also just a question : What makes Pikachu so good ? I haven't faced a good Pikachu yet so I really dunno what's the deal with him. (And I suck with him as well so I can't see for myself.) I have the impression that having next to no kill potential (Correct me if I'm wrong, really dunno what I'm talking about.) really hinders him.
Pika has low kill power, yeah, but he has easy confirms off his BnB. He's also crazy safe on block, he's a combo monster, he has TONS of traps, he has an amazing projectile, and his offstage game is scary good. I honestly have no idea why he's so under played, but I guess Pikachu has never been a very popular character in any game (I mean, even in 64 where he's the best, compare the number of Pika mains to Melee Fox and Brawl MK mains lol) and has always been a character with a small following, so Idunno, guess no one likes the mouse lol.