Champions of Norrath
Level 20 Character:
While your character is still at level 1, hold L1 + R2 + Triangle + R3 to raise him to level 20 with 75,000 coins and 999 ability points.
During play, press Start and choose 'Add/Remove Player'. Now in the Player 2 slot, just import the character you are currently using. You'll now have an exact duplicate of your character, complete with all the items and goodies. Feel free to trade things from Player 2 over to Player 1, then remove the duplicated character, then sell back the duped items for big money.
Get 100 stats in all categories at character selection:
While starting a new game, choose a 2 player game. Pick a character that you want to use. Once completed with that character move on to player two's character. Select the same character that you did for player one including the same hair, skin, gender, and hair color. When you get to the stat selector for player two's character, STOP. Go back to player one's character selection but only until you get back to the stat selector. Do not go back any further. You will have 20 more stat points to put wherever you want. Repeat this process until you have maxed out the stats of your character at 100 for each category!
Note: Stop this process when your last stat category has reached 95, because you will have too many stat points to distribute if you do it again.
Dual Wield lvl 1 for The Barbarian and The Dark Elf:
Begin a new game and pick either of these characters. Create your character normally and enter the name. Before you hit ENTER to finish the name entry, press and hold Triangle + R1 + R2 + L1 + L2 + L3 + R3. While holding all of these down, press ENTER. Keep on holding all of these down until you get to control your character, even press START to skip the cinemas to the point where you can play. Now go through and break all the objects until you can get another weapon. You will now be able to dual wield.
Thanks to Revolution readers Scott, outkastrules, Ben Hajduk, Brian, Phil, and Judah!