Yo! oi yall! I need some advice! =3 How do I keep an OC from being considered a Mary-Sue?

LOL! Yeah...Title's pretty much self explanatory... XD

So how do you people keep an OC from being despised because people think their a Sue?

Give me detailed anwsers please! <=3


LMAO! aleatório pic just for the LOLZ! 8D