cArn: He's the in-game leader of team fnatic. His job is to get information about the other team and make tactics for his team, so his team can beat the enemies.
pita: He's the backup player (aka defender) of team fnatic. His job is the defend the bombsite, so the other team can't plant the bomb.
It's Xizt's, Gux's and Friis' job to kill the enemies.