Taito DS Paddle
Taito's Arkanoid came bundled with a paddle controller that connected to the GBA slot (only in Japan). Other Taito games supported this device besides Arkanoid.
The Transfer Pak was an accessory for the Nintendo 64 that allowed the transfer of data between specific Nintendo 64 games and their counterparts on the Game Boy.
TurboGrafx-16 output accessory / memory expander.
TurboGrafx-16's pack-in control pad.
Official arcade-style joystick controller for the TurboGrafx-16 and related systems.
Multiplayer accessory for the TurboGrafx-16 and PC Engine.
Sega released this force feedback device alongside the PlayStation 2 version of Rez in Japan.