User blog comment:TheHelixYT/No Inkling For Smash 4/@comment-8182065-20150707220531/@comment-8182065-20150709054845

Well you could clearly tell who's who based on the character's size/appearance (Mii's having larger heads, hands, etc. while Link has more proper proportions) and the fact that Link/Toon Link has a shield, where the Mii Sword Fighter doesn't.

When comparing an Inkling to the costume, the proportions are pretty similar. Main difference I noticed was the facial decals (also the optional headphones Inklings wear, which the Mii's don't have).