Kalithro

The Wii U seems to be perfect for a game of this type.  Controller has voice chat / Keyboard for communication in game.

Imagine fighting Bowser in a 5 man Instance with you playing Link and 4 friends playing... Samus, Kirby,  Mario, and Yoshi.  Imagine fighting Ganondorf in a 20 man raid Instance.

Or maybe you want to be evil... You may end up in a 5 man fighting Pikachu with you playing Meta Knight and 4 friends playing... Wario, Bowser, Dark Link, and Donkey Kong.

Open world towns for grouping, trading, chatting, etc...  You group up with friends to tackle an instance or go at it with random players.

Any thoughts?

I would play something like this on the Wii U