Go to options put easy mode.Then put 1 round only.Then were it says "Change character on continue put yes." Get your best fighter go through the game with him or her. When you fight with Devil lose then choose a character like King beat Devil and get a new character. Do this throughout the game with another character and you keep on getting new characters.
Cheats
[GEAR CHANGE]
SELECT A CHARACTER WITH TRIANGLE OR SQUAREFOR CLOTHING STYLE ONE.
SELECT A CHARACTER WITH CIRCLE OR X FOR CLOTHING STYLE TWO.
[BIG HEAD MODE]
HOLD DOWN AND SELECT THEN CHOOSE A CHARACTER. KEEP IT HELD DOWN UNTIL THE ROUND BEGINS.
[SKY-MODE]
GO TO THE CHARACTER SELECTION SCREEN-HOLD UP AND SELECT- THEN CHOOSE A CHARACTER.
[INSTANT WIN]
HIGHLIGHT THE OPTION MODE AND PRESS R1,THEN PRESS O,O,X,X,O,TRIANGLE. AT THE BEGINNING OF THE GAME HOLD R1 AND L1 TO WIN THE FIGHT. ONE PLAYER GAME ONLY.
[THEATRE MODE]
1.MAKE SURE 2ND CONTROLLER IS UNPLUGGED.
2.MAKE SURE ALL CHARACTERS ARE IN YOUR MEMORY CARD.
3.BOOT UP GAME. WHEN NAMCO PRESENTS APPEARS PRESS UP,RIGHT,CIRCLE,X AND SELECT AND HOLD THE BUTTONS DOWN WHEN THE GAME STARTS IT WON'T START THE SAME WAY AS USUAL.
Personal View/Green Wire Frame
For a personal view of characters you must have all 25 characters saved to the memory card.If you have all the characters saved to the memory card then:When choosing a character hold L1+L2 until the fight starts.You should have a personal view of your opponent and your character should be animated in a green wire frame.
Taunts
After you win a match press & hold X or square and your player will taunt the loser. NOTE:This only works with some players.
Get Roger and Alex
First, you need to have all of the other characters in the game. Now, start on Arcade Mode, and when you get to the third match win with only an tiny bit of energy left. If you did it right you should hear the word "Great!". The next match will be against Roger or Alex. If you beat them they are yours. Roger and Alex are two joke characters, so only pick them for a laugh. Roger is a kangaroo and Alex is a raptor! To make this cheat a little easier, set the number of rounds to 1 and the game difficulty to Easy.
Getting All Characters
Wang
Beat the game with Jun.
Kunimitsu
Beat the game with Yoshimitsu.
Anna
Beat the game with Nina.
Baek
Beat the game with Law.
Lee
Beat the game with Heihachi.
Kuma
Beat the game with Paul.
Prototype Jack
Beat the game with Jack-2.
Armor King
Beat the game with King.
Ganryu
Beat the game with Michelle.
Bruce
Beat the game with Lei.
Kazuya
Beat the game with any sub-boss (one of the guys that you obtained earlier).
Devil
Beat the game with Kazuya.
Purple-Suited Kazuya
Highlight Kazuya and then press Start.
Play As Angel
After you have beaten the game and unlocked all of the secret characters, choose arcade or VS. mode. When selecting your character, choose devil. When you start the fight, you will be playing as angel. I don't think it's possible to actually ever play as devil.
Fight as Angel
Beat Devil using Kazuya, then select your fighter (Devil) by pressing the Kick button.
Fight as Devil
Beat Devil using Kazuya, then select your fighter (Devil) using the Punch button.