Execute Your Opponent's Moves
Get your opponent into a strong grapple then when your spirit meter is flashing "SPECIAL" press A B.
Play as Diamond Dallas Page
In League Challenge choose WCW and play the game until you get to Dallas Page. If you beat him you will be able to choose him.
Play as Glacier
Beat IU in League Challenge mode.
Play as Joe Bruiser and Black Widow
Beat all the different game modes you will get an extra menu called "Whole World Wrestling". Beat this on Heavyweight and Cruiserweight you will then play a boss. Defeat him and you will be able to play him.
Play as Macho Man Randy Savage
Beat NWO in League Challenge mode.
Play as Wrath
Choose DOA and play until you meet Wrath. Defeat him and you will be able to play him.