Why it exists
Tomodachi Life has no way to share Miis. If you want somebody else's Mii, you have to rebuild it — and to do that you first have to see it. That is what this place is for.
What happens here
People upload screenshots of their Miis, other people look at them and rebuild the ones they like. That is all of it, and it does not need to be more.
What it is not
Not a Nintendo service and not affiliated with Nintendo in any way. Not a place to trade save files. Not a place for photos of real people.
Who is behind it
Fans who like the game. The source is open — the site is AGPL-3.0 and builds on a fork of tomodachi-share.