A sequel to The Wonderful 101 has yet to be confirmed, but the game's director Hideki Kamiya has said that, if a sequel is created, he'd like to bring user-created Mii characters to the game.
"We tried to make it possible to join your own mii with TW100 as a hero," Kamiya Tweeted. "We hope we can do it in TW102."
Kamiya later Tweeted that if a sequel is made he wants to be the one in charge of its development.
Platinum Games is currently working on Bayonetta 2.
A Wonderful 101 sequel featuring Mii characters would be pretty cool, but given continued poor sales of the Wii U such a project may never be given the green light.
Source: @PG_kamiya via Siliconera