MVP is a term that means most valuable player, and is an award after each match unlocked by four different players. MVP is relative to the class you are, so different classes have different requirements to be an MVP. During the MVP display, if the player has a MVP pose, if will display. Note that MVP is different from the accolades individual players can receive that are awards based on how well they did relative to their team. MVP is comparing you to all other players.
Damage Class Edit
The Damage Class champions must have done the most damage out of all players in order to be an MVP.
Flank Class Edit
The Flank Class champions must have gotten the most killing blows out of all players in order to be an MVP.
Front Line Class Edit
The Front Line Class champions must have spent the most time in the objective out of all players in order to be an MVP.
Support Class Edit
The Support Class champions must have done the most healing out of all players jn order to be an MVP.