3 generations running on one cpu natively: Gamecube, Wii, Wii U

the gamecube isn't native to wii u, you have to use a gamecube, wii, or nintendont for that. my favorite things are youtube, the vc wii games using wii system memory for save files, vc games in general, the dual-screen aspect, the tv remote button, and the joystick placement.