Suddenly: a new Tier List..!
My opinions on it:
Looks pretty good overall! Definitely more accurate to the current metagame than the previous one.
I don't see Diddy as first, but probably top 3 (it's really hard to say, but there is no indication for any character to be the best it seems. Though it still "feels" like Sheik could take the cake).
A few letter-shifts I'd make:
Lucas from E to D.
Explained: Taiheita doesn't "suddenly" bring in (really great) results for Lucas. He has done so for quite a bit. Often gets top 8/5 at big, stacked japanese events, so I think he's better than the ones below him. Taiheitas results are consistent and good enough to warrant that. Although it seems like he's the only one doing work with him, so it might be a bit difficult to judge. And from experience (against a german Lucas named Clade) the character can really do work. He's great at zoning and at CQC, where he has so many fast and quick options that you have be ready for all of them all the time or else you'll get grabbed and eat a lot of % or could get hoo-hah'd from his kill-confirm. His (especially) standing grab has so little lag that it's not even free to punish him for it.
Olimar from E to D.
Explaination: It looks like Olimar is doing a lot of work lately. Dabuz pulls him out more and more. Shuton's been doing work with him in Japan... the character seems like he still has some potential that is overlooked by many (not too surprising since not many people are even playing him). Though it's probably safe to put him where he's now for the time being.
Roy from G to F.
Explaination: Roy seems to be underrated by many. He's definitely not a great character, but I really don't see him being "superduper bad" like most people seem to think. I seem him as being a letter above the one he's currently dwelling in.
That's probably it. I could think for quite a few "maybe this one could rise too", but not every character can be in the same tier/letter, so it's hard to say, lol.
Imo I'd say everything until G is viable to some degree. With G and below being pretty bad..
(so I guess you could say I'd move the letter F up to Mid Tier).
I also think Mewtwo is overrated by many people since Abadangos Pound? win. Mewtwo is a good/great character, but definitely not a flawless one. I'm sure Mewtwo players know the restrictions that it holds and how it can sometimes feel playing it. I would probably put it at the top of B tier, but I'm not sure, the 10th place it now has isn't unwarranted, but I really don't see it being better than that (10th).