Someone in Overwatch that takes Quickplay seriously by trying to make a perfect team and win. They have probably never been in competitive and are around Platinum skill level.

They don't realise nobody cares about Quickplay since they're just there to have fun and practice.
Quickplay Warrior: "HEY! WE NEED A HEALER, AND WHY DIDNT YOU GET ON THE PAYLOAD AT THE END LAST GAME"

Normal player: "It's just Quickplay, were just here to have fun and practice whatever we want"

Quickplay Warrior: "WE WILL LOSE BECAUSE OF YOU, WHY CANT YOU SWITCH OFF WIDOWMAKER"

Normal Person: "I want to play Widowmaker, not a healer"

Quickplay Warrior: "OMG MY TEAMMATES ARE SO USELESS, IM ALWAYS HELPING OUT BY PLAYING TANKS IN QUICKPLAY"

Normal person: "Shut up, Quickplay Warrior, literally nobody cares, why don't you play competitive if you want to try?"

Quickplay Warrior: *silence*
by Hitler The Fuhrer September 1, 2017
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