>>971>bagpipes,People hate bagpipes. Nobody like them besides the Scots. So unless you are in Scotland, I think you have a better chance of getting your ass kicked than making money.
>Accordion Isn't far behind in terms of general dislike.
I think a keyboard is your best bet, but some places don't allow any amplifiers for busking which would rule that out. Guitar also has a reputation for people that can't play more than like 3 chords forcing people to listen to their shitty singing. So I guess violin is your best bet of what you listed.
Can you really play all those instruments? I think your best bet for busking is anything you can involve the crowd in and get crowd interaction.