This has been a big problem for us getting the custom project together, and I feel like Mii Fighter mains probably have great concerns about this topic as well. We need clarity on this issue, true clarity, months ago, and since that didn't happen, we need it just about RIGHT NOW. What are the tournament rules going to be as a community standard for Mii sizes?
Here's the logistical situation. Mii Maker is absurdly slow to the point that it's honestly absurd to allow players to go into it and make their own Miis in a tournament of any scale. However, Miis of arbitrary size can be imported from a 3ds, but 3ds Mii Maker is really slow too of course so you have to be absolutely sure they've been made before the day of the tournament.
In terms of importing everything, you do have to remember that setting it all up and scrolling through things is a real time sink. Mii Gunner and Mii Swordfighter seem to have some of the most diverse set of viable custom moves of any character; even if we ignore size, both will want around 20 sets... which can be done since Mii Fighter has way more space available than the other characters, but it's obviously insane to ask TOs to make let's say 60 Mii Swordfighter sets to account for 20 movesets and three sizes. Allowing people to import whatever on the day of event is great but not practical for national scale events... which is kinda too big of a problem to just overlook.
There's also the preparation issue. Mii Fighters can have a wide variety of arbitrary performances, and even little tweaks have been found like adding very specific amounts of weight can make certain moves in certain situations combo or not combo and certain amounts of height can let you win priority wars you otherwise lose. Learning every nuance of this even as a main of one of the Mii Fighters seems insane; learning how to fight against it may actually be unreasonable (mastering the nuance of fighting against every possible variation of the Mii Fighters is probably more work than mastering fighting against every custom version of every other character put together).
It seems likely necessary to standardize on one size per Mii Fighter. That solves every issue at once. The important question is this: which size? The optimum sizes for gameplay purposes are pretty much known (absolute min-size for Brawler, min width 1/4 height for Gunner and Swordfighter); we could use those. Some prefer instead to allow just default. There are very, very large pros and cons to each side.
Optimum size allows these characters to be everything they can be; it isn't using the rules to artificially limit the performance of characters, is only imposing a limit for the sake of logistics.
Default is clean and simple; it has the fastest set-up time (you can use guest miis, and yes, all six guest miis are identical gameplay wise), and it's also in a way the least arbitrary since it's a default.
The gameplay implications are profound. Mii Brawler with optimum size is blatantly top tier, arguably the single best character in the game. He's really awkward and hard to play, but he's an extremely mobile powerhouse who can convert stray hits and grabs into fair strings into early Helicopter Kick kills. It has been argued he might even be broken, but there's essentially zero tournament evidence to substantiate this. Default Mii Brawler still seems like a clearly good character but is probably not a tip-top tier character. On the other hand, Mii Gunner and Mii Swordfighter break the other way on the balance curve. Mii Gunner is extremely complex and poorly explored, but there's a lot of reason to be optimistic about the optimum one while the default one seems likely not worth it in the end. If I had to guess, optimum size is upper mid while default size is lower mid. Mii Swordfighter seems like a pretty bad character all around, but default Mii Swordfighter is just comically bad, perhaps the single worst character in the game. So basically, optimum pushes all three up on the tier list, perhaps pushing Brawler too high, but default pushes all three down, likely pushing Gunner and Swordfighter unfairly low. There are large drawbacks to both possibilities, and no, there's no way a middle of the road compromise is sane here no one is going to go for forcing Brawler to default but letting Gunner and Swordfighter have better sizes because we feel sorry for them. That would be profoundly unfair in a way neither "pure" option is.
In terms of actual tournaments so far, almost every tournament has their own rules on this. Some ban Mii Fighters entirely (WHY?), others use the APEX rule that effectively bans them (1111 default size is a joke character with every archetype), some allow only default size, others allow whatever size you want. Real players as a group seem really apprehensive about picking these characters since you just never know what will be legal or not, and it seems like a huge risk to learn anything since there's no consistency on the rules that determine everything about what's actually good here.
So far in the custom project we've been assuming that optimum should be allowed (since rules that intentionally nerf characters are really dubious in my book), but we've run into so many people who feel that only default size should be allowed and it's pretty obvious that there are huge divisions here and that a lot of people overlook it since so few people main these characters. I'd like to at least know where people stand, and I think essentially every TO would benefit from the same thing. If most people agree on one position, it would help us as a group greatly. If we don't agree as a group, we need to figure this out, like, yesterday and work it out. This is IMO the single most important ruleset issue to be discussed right now since the current lack of a standard makes three whole characters essentially unusable for serious players.
tl;dr version: We need to only allow one size on Mii Fighters for logistical reasons most likely. Should that size be the one that is most advantageous to the Mii Fighters (optimum size) or the default size? Please vote in the poll.
Here's the logistical situation. Mii Maker is absurdly slow to the point that it's honestly absurd to allow players to go into it and make their own Miis in a tournament of any scale. However, Miis of arbitrary size can be imported from a 3ds, but 3ds Mii Maker is really slow too of course so you have to be absolutely sure they've been made before the day of the tournament.
In terms of importing everything, you do have to remember that setting it all up and scrolling through things is a real time sink. Mii Gunner and Mii Swordfighter seem to have some of the most diverse set of viable custom moves of any character; even if we ignore size, both will want around 20 sets... which can be done since Mii Fighter has way more space available than the other characters, but it's obviously insane to ask TOs to make let's say 60 Mii Swordfighter sets to account for 20 movesets and three sizes. Allowing people to import whatever on the day of event is great but not practical for national scale events... which is kinda too big of a problem to just overlook.
There's also the preparation issue. Mii Fighters can have a wide variety of arbitrary performances, and even little tweaks have been found like adding very specific amounts of weight can make certain moves in certain situations combo or not combo and certain amounts of height can let you win priority wars you otherwise lose. Learning every nuance of this even as a main of one of the Mii Fighters seems insane; learning how to fight against it may actually be unreasonable (mastering the nuance of fighting against every possible variation of the Mii Fighters is probably more work than mastering fighting against every custom version of every other character put together).
It seems likely necessary to standardize on one size per Mii Fighter. That solves every issue at once. The important question is this: which size? The optimum sizes for gameplay purposes are pretty much known (absolute min-size for Brawler, min width 1/4 height for Gunner and Swordfighter); we could use those. Some prefer instead to allow just default. There are very, very large pros and cons to each side.
Optimum size allows these characters to be everything they can be; it isn't using the rules to artificially limit the performance of characters, is only imposing a limit for the sake of logistics.
Default is clean and simple; it has the fastest set-up time (you can use guest miis, and yes, all six guest miis are identical gameplay wise), and it's also in a way the least arbitrary since it's a default.
The gameplay implications are profound. Mii Brawler with optimum size is blatantly top tier, arguably the single best character in the game. He's really awkward and hard to play, but he's an extremely mobile powerhouse who can convert stray hits and grabs into fair strings into early Helicopter Kick kills. It has been argued he might even be broken, but there's essentially zero tournament evidence to substantiate this. Default Mii Brawler still seems like a clearly good character but is probably not a tip-top tier character. On the other hand, Mii Gunner and Mii Swordfighter break the other way on the balance curve. Mii Gunner is extremely complex and poorly explored, but there's a lot of reason to be optimistic about the optimum one while the default one seems likely not worth it in the end. If I had to guess, optimum size is upper mid while default size is lower mid. Mii Swordfighter seems like a pretty bad character all around, but default Mii Swordfighter is just comically bad, perhaps the single worst character in the game. So basically, optimum pushes all three up on the tier list, perhaps pushing Brawler too high, but default pushes all three down, likely pushing Gunner and Swordfighter unfairly low. There are large drawbacks to both possibilities, and no, there's no way a middle of the road compromise is sane here no one is going to go for forcing Brawler to default but letting Gunner and Swordfighter have better sizes because we feel sorry for them. That would be profoundly unfair in a way neither "pure" option is.
In terms of actual tournaments so far, almost every tournament has their own rules on this. Some ban Mii Fighters entirely (WHY?), others use the APEX rule that effectively bans them (1111 default size is a joke character with every archetype), some allow only default size, others allow whatever size you want. Real players as a group seem really apprehensive about picking these characters since you just never know what will be legal or not, and it seems like a huge risk to learn anything since there's no consistency on the rules that determine everything about what's actually good here.
So far in the custom project we've been assuming that optimum should be allowed (since rules that intentionally nerf characters are really dubious in my book), but we've run into so many people who feel that only default size should be allowed and it's pretty obvious that there are huge divisions here and that a lot of people overlook it since so few people main these characters. I'd like to at least know where people stand, and I think essentially every TO would benefit from the same thing. If most people agree on one position, it would help us as a group greatly. If we don't agree as a group, we need to figure this out, like, yesterday and work it out. This is IMO the single most important ruleset issue to be discussed right now since the current lack of a standard makes three whole characters essentially unusable for serious players.
tl;dr version: We need to only allow one size on Mii Fighters for logistical reasons most likely. Should that size be the one that is most advantageous to the Mii Fighters (optimum size) or the default size? Please vote in the poll.