Byxis
Smash Journeyman
But with Marth you automatically know what size he's going to be.Are you trying to imply that you think Miis will change size in the middle of battle? Because normally, you'd go, "Oh, that Mii is tall! It has good range, I should watch out for that." Unless the hitboxes aren't set up right, you can tell how much range something has just by looking at it and knowing how it works.
You don't have to worry about fighting Marth and going "Ok, so will he be really tall NBA Marth, Normal Marth, ****** Marth, Mini Marth, etc."
Miis appear to come in all sorts of heights that may or may not at all effect their range, weight, character model size, etc.