Thoughts on select characters (characters about which I currently have thoughts, obviously far from complete):
Luigi:
I believe there have been recent developments to suggest Ice Balls are pretty great, definitely going to be sure to include some sets with them.
Bowser:
After great consideration, I've decided that MrEh makes an excellent point and that 1211 and 1311 should be movesets included for Bowser. Once I decided to retain these two sets, my next logical leap was to think about expanding the sets available for less enlightened Bowsers. I'm thinking 1231, 3211, and 1313 will finish a few iterative options. For #10, maybe 1312? We all know none of these sets are great as they are not 1211 or 1311, but we are aiming for stuff to make everyone as happy as is possible.
Rosalina:
3211
3213
3311
3313
Power Luma Shot is the best move she doesn't have incorporated right now, and I think it's worth fully supporting. I don't think anyone would really use 1211 or 1213 to be honest; Floaty Star Bit has nearly perfectly wrong synergy with default Luma Shot. To be real, I think the overwhelming majority of the time Rosalina will use 2311 or 2313 and the latter only against opponents like DK who have nothing to absorb with Gravitational Pull.
My biggest worry is excluding "from the game" both Launch Star variants. Launch Star Plus just seems horrible to me, gutting Rosalina's recovery options for questionable speed improvements, but didn't dabuz say he liked it with his opinion here being really important? Launch Star Attack is ridiculously marginal, like seriously the worst offensive up special ever, but I can see some situation possibly arising in which the hitboxes are needed to bypass an edgeguard or something. I definitely don't want to drop any of the six sets she currently has; it's mostly a question of whether Power Luma Shot deserves full support or whether some of the space it promises to take should be given to up special variants.
Little Mac:
I definitely plan to flesh out support for Grounding Blow with the extra space; that move being undersupported is the main flaw with Mac's current list for sure. I will likely include 3111 as well just because some people like it, but I'll have to think about the details for that one.
Ganondorf:
With 10 full slots to use, Warlock Thrust needs some sets. 3322 and 3122 seem obvious to include. I'm thinking some Flame Wave sets to round it out (2222 and 2221?).
Marth/Lucina:
I'm going to throw in every combo I don't have of neutral-3, up-3, and down-3 (that would be 1131 and 3113), 3121, and then think really hard about the last set (candidates are 1123, 3123, and X3XX currently leaning to 1311).
Robin:
1311 for sure as that's the only truly useful excluded set, probably some Gliding Elwind stuff to round it out (like 1131, 2131, 3131?). Robin is pretty well covered as long as all combinations of Thunder variants and side-1/side-3 combos are covered.
Dr. Mario:
Huge pills seem to have some real use unlike Mario's huge fireball? Going to have to work it in somehow. Does anyone know what boss prefers on Dr. Mario (or any of his other characters)? That would be great information.
Sonic:
I think his best move that is not supported right now is Gravitational Charge (down-3). 1211 is the one true Sonic set, default is a very competitive second best, anything with Double Spring is the dubious but plausible third, and the rest is... poor. After including 1113 and 1213, I'm thinking 3111 and 3211 may be the best remaining options even though, for serious, Surprise Attack is a really poor move (but up-3 and down-2 are pretty much not moves at all so neutral-3 may be the best direction to go to fill these slots).
Mii Brawler:
As per the frequent and wise suggestion of Jigglymaster, 2122 is going to be added for sure. I'm unsure of how to handle Piston Punch; it's clearly sub-optimal except for abusing a really silly gimmick that is very rarely of real merit. Should it be included, or should we save ourselves some serious stress and just drop this move (not banned just... not included)? I'm also not sure if side-2 or side-3 are worth using over Onslaught; all three are pretty marginal moves, but I've seen niche uses of all of them and am not sure standardizing on Onslaught is optimal.
In terms of Mii sizes, and this applies to all of them, I'm thinking including min size, default size, and min width max height for all sets may actually be best. This is clean and simple. For Brawler I'm pretty sure it includes every plausible option for size that a real player might want. I've seen suggested that a middling height setting suggested for Swordfighter and Gunner a few times; how should we proceed with that? That could be difficult to communicate and standardize among many different 3ds units nationwide. I don't want any player to be forced to use anything sub-optimal if it can at all be avoided, and we need it to be very clear right now that the Mii Fighter characters are just as important as all of the other characters and are going to be a significant priority in this update as the old sets for them did not represent my best effort nor the best effort of the community on them. I just want to make sure we can have identical player experiences, and if it's an arbitrary point on the slider, I worry that different people will have it off a tick and it would be a terrible look on the community if some Mii Gunner player claimed to have lost a tournament set because the set-up he was using had that pre-set built one tick too short or something whereas it's very clean and non-ambiguous with extreme slider settings (or using guest Miis). I want thoughts on this.
Mewtwo:
I have no idea when he's going to release or if he's going to be legal at EVO or any other particular events, but my Spinarak sense tells me that it's very likely going to be in March. Regardless of how far along things are (even if they're already finished!), this project is going to do a rush job on Mewtwo as soon as he releases to add him to the project. No one is going to be left out at any point for playing the DLC character on account of this project even if we currently have no idea what customs he even has and will have to seriously hustle whenever he drops.