How to Unlock
Alternate Models in Model Viewer
In Model Viewer, choose Arthur, Dante, or Phoenix. Once their model shows up, press the Select button to switch to alternate models for each of the characters. They also have alternate colors that can be viewed by pushing the "x" button.
Deadpool Special Tag In
Hold Taunt while tagging in Deadpool and something special will occur.
Quick Reset in Training Mode and Mission Mode
In either mode press Start+Select which will reset you to the middle of screen. Start+Select+Right/Left will reset you to the corner on the Right/Left side (training mode only). Any of the above commands+holding down Assist 1 or 2 will reset in the desired location with one of your other party members.
Start match as 2nd or 3rd Character
During the Versus or Loading Screen, press and hold the Partner 1 or Partner 2 button to start the match as one of your other characters.
Switch assist position
If you hold Partner 1+ Partner 2 buttons before the match starts, your assist characters will be swapped.