Select Name, Personality, and Background
You may have been thinking about this all during the character-creation process, but now it's time to give your character his name, personality, and background; the traits which make him a real character.

Name
You should give your character a name appropriate to the world in which he'll be adventuring. Choose a name carefully. It should represent the character in some way, or at least be a name you like. You might find yourself playing this character for years, and if you give him a silly or inappropriate name, you might regret it later. The GM will change the name of your game name once you have this selection made.  Notify the GM when you have selected a name for the character in a private message.

Personality
Alignment isn't all there is to a character's personality. You should think about your character, about his mannerisms, the way he speaks, the way he dresses, how he spends money, what sort of people he likes, how he likes to spend his non-adventuring time, and so on. The more attention you invest in imagining your character, with all his traits, virtues, and vices, the more interesting and "real" you will make him. Sure, it's useful for your character to be the mightiest warrior in the world . . . but none of the other player characters will care whether he lives or dies unless he has a personality. Nor will he be remembered.

Background
At some point, you'll need to decide on your character's background: where and when he was born, how he was reared, who his family is, who his friends were, and what he did up until the time he enters play. A background is important because it can give you pre-adventuring skills that may come up as being useful some time down the road in the story. While not entirely required to play the game, it is useful for character development and a tool the GM can use to build a backstory, a story arc, etc.