Select win pose
During a replay at the end of a match, hold any of the four directional buttons before the game approaches the "Winner" screen. The win pose is determined by which directional button is held. (For example, hold Left while Akira wins a match to do his "Juunen hayaindayo!" pose.)
Reach the rank of 1st Dan with any character to unlock their "C" costume. Complete anyone's first orb disk to unlock their "D" costume.
Dojo training stages:
Finish Time Attack mode, and after selecting characters for versus mode, press up twice or down twice.
Change fight order:
At the character selection screen in Arcade mode, when the "Yes or No" option appears, hold Guard or Punch until the match begins to fight characters in a different order.
Custom characters in Movie Theatre:
Enter the VFTV Movie Theatre, highlight the Wolf-El Blaze or Eileen demo movie, then hold Left and press X. The movie will now feature your customized version of that character.
SEGA balloon item battles:
Win the "Virtua Fighter World Tournament Finals" in Quest mode. A SEGA balloon will now randomly appear on the Quest mode map screen. When this happens, fight in any arena and the next ten battles will be item battles because of the balloon.
Classic Sega theme:
Before the Sega logo appears when the game is first loading, hold Circle to hear the classic "SEEEGA" music from the Genesis console when the Sega logo appears.
Select VF.TV->Exhibition Match->At the character select screen than press and hold L1+R1 and hit X.
If done correct you will hear a musical jingle
Now VF5 will create random matches until you quit out.
Thanks to Revolution Readers BLASTFIST and joramund!