It is considered custom by the game's parameters. The Miis are custom fighters that are customized in the customs section of the game. If this is not done, they do not exist. Therefore, they are custom.
I agree, but they are allowed in the Customs OFF in-game settings.
I don't think forcing them into 1111 is good, it's a half assed compromise, they are designed to have varied movesets.
Should we follow the Customs OFF in-game settings in our customless meta and allow Mii Fighters in? I'd say yes, they are 3 unique characters that are designed to have different movesets. Allowing them different movesets would not be harmful to the meta.
It's really a question of "Do we want created characters (Miis) to be allowed?"
I'd say it should be fine, logistically they cause no issues, competitively they aren't broken.
Define custom please.
I don't have to.
My opinion of what a custom is and yours are different. I feel Miis are custom CHARACTERS that have alternate specials, they are not designed to have a default moveset. I don't think we should argue about this, it'd cause circular arguments and disagreements on definitions.
We should just debate on whether it's okay to allow them with their full movesets, arguing over definitions is stupid.
I'd say it's perfectly okay, I do not care if it's seen as an exception to your eyes, it allows 3 characters into the meta as they're designed to be played.