If you want to know what MVP stands for, it's Most Valuable Player. It's basicly the best player of the game. In barn brawl for example, you become MVP if you captured the most animals, and so has every game a different challenge to become MVP.
(Most negative mobs for attack mode)
For Linedash yes most kills
Paintball normal most kills same goes for CTF however CTF you are more likely to get it if you capture more flags since flags give you about 10 kills
In layer spleef there is no MVP
Finally in wing rush there is no MVP
Also just in case in Minerware there is no MVP even though I assume you put that in the tags to refer to Minerware the name of the player with most wins
However that isn't how you actually tag people
To tag players you have to put an @ Than type their name after it For example
@xImU_O Than that notified you in you right latest alerts