Use the DJ
In order to use the DJ (that's right, the announcer!) you have to
defeat DJ in the tournament. I believe you cannot have any "Try
agains" in order to get this character. If you're using DJ, Kenny
or Tyson will be the announcer.
Get Dual Dragoon bit beast
Beat the national championship once and talk to DJ in the lobby,
and he'll give you the Dual Dragoon bit chip.
Unlock Daichi
In order to unlock the little guy Daichi, you have to defeat him
in Tournament Mode. When you defeat Daichi and win the tournament
(he'll randomly appear), he will join your roster.
