Did they ever use that robot for anything else after that besides a dust collector?
Yeah, they made one other game called "Stack-Em" that you had to use R.O.B. in order to play it.
Other than that, the R.O.B. character has made a few appearances, most notably in the Mario Kart DS game as a badass unlockable character which I proudly showed off here when I beat the game:
Hybrid Mode
