Usually tell them I have no interest and if that doesn't work, simply ignore them

Tell them to go fuck off...

Hit on them back! Flirting is fun~

Attack them...

Whack them with my staff!

Firmly tell them to take it somewhere else

... Burn them..

Threaten to slice them up...

Ignore them until they went away or go talk to someone else.

Uh... to be honest I'm a bit too nice about it so nothing would work anyways ^^;