Hosts

In the Crystal Maze Online Adventure, each team is guided by a host known as a Maze Master.

A Maze Master adopts the role of the Maze's custodian and is responsible for guiding each team around the various zones, keeping them updated on their progress, acting as the timekeeper on all games and the final challenge at the Dome, and taking safe custody of each crystal won by the team. Each Maze Master has a team sheet, which contains the Maze route, game category and game name. The player and outcome fields are entered manually as the game progresses alongside the current number of Crystals the team hold.

Inhabitants
The Crystal Maze is home to several characters that operate in some capacity to challenge the visiting team. During early development, Robert intended for a number of different characters to inhabit the Maze and build fictional stories based on them.

Current characters

 * The Baron: introduced in Series 1, The Baron is an unnamed nobleman who oversees an automatic lock-in game in the Medieval, Industrial and Ocean zones. He enjoys gin, was married "until the accident", is proficient in playing the lute and enjoys the music of Bobby Darin. Originally introduced as an assistant to the current Maze Master, The Baron has since become the Online Adventure's version of "Mumsey". In Series 12, The Baron replaced The Computer in the Futuristic zone.

Former characters

 * The Computer: introduced in Series 2, The Computer is an operating system of the Futuristic zone that teams must give a password to enter. The Computer also serves for several interactive games has shown to be sarcastic towards the teams efforts. Appearances of The Computer have been sporadic since Series 6.
 * Quetzy: introduced in Series 3, Quetzy is a grumpy deity in Mesoamerican culture who oversees "Quetzy's Flags", an automatic lock-in game in the Aztec zone. Quetzy speaks in a formal tone and intentionally mispronounces contestants names to their ire and his enjoyment.

Reception
The Maze Masters are regularly praised for their hosting styles, humour and energy throughout each teams game as reflected in their post-game reviews.