If you reject Fr4gGingR1teZ's friend request you get a 100% Evil alignment.
If you pwn every forum, deploy every XSS and FBO code possible, and you get 1000 job points, you will be given access to a secret forum called "1chan", which is level 99.
If you get go to the login screen and enter "firstname.lastname@example.org" for the email, and the password "change_character_" followed by your character's name, you can change your class.
If you get all right answers on the DrrtyCop74 pickup lines minigame, you get the ability "threaten to use lethal force", which has 999 attack.
If you have over 20 medals and have played for over a year, you gain access to a "veteran" domination bracket where you win twice as many medals and can buy special domination cards (an example is the "doomsday" card which makes one player lose all of their scoops).
If you get The Lonely Gunman to trust you 100%, you can get into the secret sentrillion forum.