Korra

You are a guy (or whatever gender you want to be) that can't be killed by physical impact, even if you hands or legs get cut , you will be able to get them back over time... and you sign up with a group of assassins to be the test subject, which means they will send some people to try and kill you and inexchange you will get a lot of money. this time you found a young girl following you around... if your math correct she is the number 420 assassin that trys to kill you