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.
GTAV online - I would totally end up being screwed with all of the mayhem in the public lobbies. I told my wife I think we’d probably be an unseen NPC homebodies never setting foot outside and ordering from the Pizza place. :)
If it was the GTAV Story mode, I think I’d be much better off and be part of the beach groups as I love the ocean IRL.