We are still searching for game pictures and screenshots for Giant Gram (Dreamcast). We do not have any cheats, codes, or hints yet.

Highlight Wolf, Jeffry, or Kage at the character selection screen. Then hold R and press A to enable their Virtua Fighter 3tb two player mode costumes.

Taunts are done with right and left shift buttons. So far most characters have two taunts: one with the right and one with left.
Also, at times the shift buttons will change camera views.

Press L or R when you are in watch mode for different camera angles.

Hold all buttons for 5 seconds during the title screen.

Successfully complete tournament mode to face one of the hidden wrestlers in a match. Defeat that wrestler to unlock that character as selectable. Save the game and repeat tournament mode to face the next hidden wrestler.