Console features that may never return.

[G2ThaUNiT]

Crazy peripherals/controllers.

Some that immediately come to mind would be the Dreamcast fishing rod, light guns, Gamecube chainsaw controller for RE4, Power Glove, Samba De Amigos maracas, DK Bongos, Dreamcast microphone, and Game Boy camera/printer. I remember there being a card scanner on the GBA too.

Pretty much all were hit or miss, but it was just an awesome level of creativity that has since disappeared. Outside of standard controllers, you'll primarily only ever find arcade sticks, flight sticks, keyboard n mouse, and steering wheels in terms of alternative peripherals for gameplay.