So the new book Legacy of the First World came out recently. And in it, there is the Twinned Summoner, which basically allows you to summon an eidolon that looks like you.
The Eidolon gets all teamwork feats you have for free, and can have one item slot that doesn't count against your link. It also gets a heavy +16 to disguise itself as you.
So there is two of me now. I figure, lets push it further, and took Vomit Twin spell. Which would allow my Eidolon and myself to both throw up a copy of our selves.
Then for a magic item, Pick up the Decoy Ring. Now anytime we make a withdraw action or become helpless there is four more of us.
I've also picked up a familiar, Valet instead of Decoy. That way it has all the same teamwork feats I do again as well.
I could pick up a familiar for the Eidolon as well, and make it so it has a decoy familiar.. Which would let the familiar copy it, copying me.
My main issue though is unifying this in something that would actually be useful in game. I do have a particular trick with it, where Gem and Ini both carry around a wand to cast their magic. Only in Gem's case she doesn't use the magic from the wand. While Ini UMDs the wand and bluffs that its her own magic the whole time.
If you're Small, there's an Alchemical Item that allows a Homunculus to look like you. Which could be used by both you and your Eidolon.
There's a teamwork feat, Elemental Commixture, which you might like. There's plenty of more physical teamwork feats too, especially for combat maneuvers. The question is - what do you want to do?