The Last game I played was Splatoon 3. It really depends on a few things, Am I an Inkling/Octoling? Do I speak the language? Where am I? In Splatoon lore all humans died in mass floods, so if I was still human I would probably be studied. Also, if I’m in the middle of the ocean I would be screwed either way. Assuming that I am in a major city or at least near civilization, and I am an Inkling/Octoling, and I speak the language, I would be fine. As for what I would do, I would sign up to work at Grizco, and once I have enough money buy a gun and participate in turf wars to gain money, eventually buying an appartment.
TOTK. If I was a random villager I’d probably be OK.
If I was Link I’d die to the first red Bokoblin I encountered.
If I was Ganondorf I’d be twiddling my thumbs waiting as Link got sidetracked by side questing and “hey I bet there’s something cool at the top of this cliff”.