Last Bronx
Play as Redeye
Beat the game in PC mode on the hard difficulty level.
Alternate weapons
On the character selection screen, highlight a fighter. Then, press [Start] thirteen times, hold that key down on the last time it is pressed and hold [Block] simultaneously. Now keep both buttons held until the loading screen appears.
The image featured at the top of this post is ©The Legend of Heroes: Trails of Cold Steel III key art.