R.O.B.
R.O.B. has become something of a beloved Nintendo icon by now (for some reason), and has a regular starting spot in the base rosters of games like Mario Kart and Smash Bros. But the robot actually started life as- well, an actual robot. Nintend released it as a proper accessory for the NES, and had plans to support it quite a bit. Though they ultimately ended up releasing only two R.O.B. compatible games, at least it was a cool, novel toy.
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