An (open-world?) Star Wars stealth game where you play as R2-D2. You can hack computers, fly spacecraft, sabotage equipment, take sensor readings, and generally engage in the same kinds of creative shenanigans you see in the movies. I'm picturing a heavy element of movement-based puzzles - how to get to that platform? I'm baffled that this isn't already a thing, outside of mayyyybe Lego Star Wars.
I've always dreamed of this, too. Something like the T3-M4 sequences in KOTOR, but with an expansive hacking element. I think there's lots of opportunity to use astromech droids as the stars of stealth games. In-universe, most humanoids tend to ignore astromechs as unimportant pencil-pushers, and so the cat-and-mouse of most modern stealth games (just wait 'till the alarm icon ticks down, and you're good) would be narratively apropos.