Player is the default term for anyone who is actively engaged in the Mondo Megabits game in question.
Each player has their own deck of cards to play with during a game.
Each player starts with a Narrative Score of 0.
In lore, the player is also referred to as The Puppet-Master (or one of many competing puppetmasters).
In all -mgxmix- rules text, things relating to players will keep the default term.