Imagine yourself actually being the character you have created and act as your character would. NERO is a fantasy roleplaying game, based in a pseudo-medieval era. You may design a character that is like yourself or you can be someone totally unlike yourself, and develop a new perspective on the world. You can create a character that does things you would like to do but can never work up the never to try. You can be a fierce warrior, a sneaky thief, or a crafty mage.
Many people are more comfortable creating a character that is mostly like themselves.
Others prefer to play a persona that is completely opposite. Please remember to be considerate of the other players. Abusing other characters could be going too far, even if it makes sense for your character concept. After all, you created your character in the first place. The NERO code of conduct details this in greater detail.