Variety.Gamer 4438
Always start again
I personally don't get the "feature" of having the other profiles join the same island. I will have to make a new profile to have a second house on the island and that one then needs their own Nintendo Online to play online? Bit of weird call on their part. It wouldn't be about technical restriction either; this is just a weird decision they made (at least IF this is the case, Im not 100% sure if it is confirmed that this is the only way to get multiple chars on one island, but it sounds like a thing they would do honestly).
Anyway, the price of a new Switch for a new island is of course way too much. The only way I can imagine ever doing this, is if they released a superior model of the Switch, like a pro version (which has been rumoured). But otherwise, no thanks.
No, just like every other game you can have multiple characters (probably up to four) on one account I'm sure.