Kurohyō: Ryū ga Gotoku Shinshō
The game's data contains four unused weapons: a pistol, a minigun, a combat knife, and knuckledusters. While the only thing that remains of the first three are textures (indicating they didn't make it far into development), the knuckledusters are fully modeled.
The game's data contains an unused model for protagonist Tatsuya Ukyo wearing a baggy silver tracksuit. In the final game, he only wears a black-and-gold tracksuit and a pair of black boxing shorts depending on the story segment, with no option to manually change outfits. It is unknown how this outfit would have been obtained in-game.